High Gain Collinear Antenna for 145 MHz and 433 MHz Bands

High Gain Collinear Antenna for 145 MHz and 433 MHz Bands: High-gain collinear antenna for 145 MHz and 433 MHz with 0.64λ elements and 0.25λ phasing for strong omnidirectional VHF/UHF performance

Build Your Own 6m Delta Loop Antenna: A Simple Weekend Project

Build Your Own 6m Delta Loop Antenna: A Simple Weekend Project: Learn how to build a simple and effective 6m Delta Loop antenna using wire, PVC conduit, and a 75-ohm matching section for the 50MHz band.

Build Your Own 6m Delta Loop Antenna: A Simple Weekend Project

Build Your Own 6m Delta Loop Antenna: A Simple Weekend Project: Learn how to build a simple and effective 6m Delta Loop antenna using wire, PVC conduit, and a 75-ohm matching section for the 50MHz band.

UR0GT Broadband Avia Antenna (RW4HVN Mod): The Ultimate Wideband VHF Antenna Guide

UR0GT Broadband Avia Antenna (RW4HVN Mod): The Ultimate Wideband VHF Antenna Guide: Detailed guide to building UR0GT Broadband Avia Antenna modified by RW4HVN. Covers dimensions, design principles, SWR performance, construction details

Bi-Square Antenna: A High-Gain design for upper HF and VHF

Bi-Square Antenna: A High-Gain design for upper HF and VHF: Build a high gain bi-square antenna for higher HF bands. Get 4dB gain over dipole on 10 meters with detailed calculations, matching solutions, operation tips.

How to Build a Reduced Size 40M Antenna – Complete DIY Guide

Want a smaller 40m antenna that still works great? This DIY guide walks you through building a reduced-size 40 m antenna from scratch — simple, effective, and perfect for limited space! 🛠️🌍

Check it out 👉 https://vu3dxr.in/how-to-build-a-reduced-size-40m-antenna-complete-diy-guide/

#HamRadio #40m #Antenna #DIY #RadioLife

40m Vertical Antenna: Compact Base-Loaded Design for Powerful HF Operation

Ready to Get on 40m with a Compact, Powerful Antenna? 🔥🚀

If you’ve ever wanted strong HF performance but didn’t have the space for a giant tower… this is for you! 🌍📡

👉 Check out this sleek 40m Vertical Antenna build — a compact base-loaded design that lets you operate on the popular 40-meter HF band without needing 10 m of mast or acres of yard! 🏠✨ You’ll be amazed at how a clever loading coil and smart design let this short antenna resonate just like a full-size vertical. 💪📻

📌 Why it rocks:
✔ Only ~3.4 m tall — perfect for balconies, rooftops & limited space 🏡
✔ Excellent DX on 7 MHz — regional by day, long-distance by night 🌐
✔ Easy DIY build with common materials 🛠
✔ Great for portable or home HF stations 🎒📻
✔ More efficient than you’d expect — and super fun to build! 🤩

Whether you’re a seasoned ham or a DIY enthusiast wanting to push your antenna skills further, this project is 🔝. Check it out here:
👉 https://vu3dxr.in/40m-vertical-antenna-compact-base-loaded-design-for-powerful-hf-operation/

Let’s get those QSOs rolling! 🗣️📡💬

Shortened Inverted V Antenna for 80 Meters (3.700 MHz)

Shortened Inverted V Antenna for 80 Meters (3.700 MHz): Build a high-performance shortened inverted V antenna for 80 meters. Compact design, loading coils, measurements, and installation guide for strong HF signals.

UR0GT Broadband Avia Antenna (RW4HVN Mod): The Ultimate Wideband VHF Antenna Guide

Looking to build a powerful wideband VHF antenna? Check out this ultimate guide to the UR0GT Broadband Avia Antenna (RW4HVN Mod) — packed with practical insights, step-by-step instructions, and performance tips. Perfect for ham radio enthusiasts and VHF explorers! 🙌

👉 Read more: https://vu3dxr.in/ur0gt-broadband-avia-antenna-rw4hvn-mod-the-ultimate-wideband-vhf-antenna-guide/

#HamRadio #VHF #AntennaDesign #DIYRadio #AmateurRadio

DIY 80m Magnetic Loop Antenna: A Compact Solution for Low Bands

DIY 80m Magnetic Loop Antenna: A Compact Solution for Low Bands: Learn how to build a compact 80m Magnetic Loop Antenna. Includes dimensions, capacitor specs, and tuning tips for efficient HF operation in small spaces.

W3DZZ Multi-Band Antenna 80m-10m Trapped Dipole

The W3DZZ Multi-Band Antenna has earned a reputation as one of the most reliable multiband wire antennas in amateur radio. Designed to cover five HF bands from a single feed point, it offers a simple alternative to fan dipoles or complicated matching networks. With only two tuned traps and ordinary wire, the antenna provides effective operation on 80, 40, 20, 15 and 10 meters.

What makes the design so successful is the way the traps divide the antenna electrically. On 40 meters and higher, the traps act as high-impedance barriers so that only the inner sections radiate. On 80 meters the traps behave as loading inductors, allowing the full length of the antenna to function as a shortened dipole. This clever approach gives multiband coverage without switching or tuners in most installations.

W3DZZ Multi-Band Antenna 80m-10m Trapped Dipole: 

Simple Speech Processor for Homebrew SSB Transceivers

Good speech processing can make a dramatic difference to how a low-power SSB signal sounds on air. In homebrew and QRP SSB transceivers,  transmitter audio is often clean but lacks average power, making signals sound weak during normal conversation. The compact Simple Speech Processor circuit shown here addresses that exact problem by increasing average talk power while preserving intelligibility and keeping distortion under control.

This design, originally shared and discussed on the Small Wonder QRP blog, has become popular among home constructors because it is simple, effective, and well suited for integration into BITX-style and other minimalist SSB rigs.

Simple Speech Processor for Homebrew SSB Transceivers

Shortened G5RV Antenna – DX Power in a Smaller Package

Shortened G5RV Antenna – DX Power in a Smaller Package: A compact, multi-band wire antenna based on the legendary G5RV design —specifically, a shortened version of G5RV antenna optimized for the 14-50 MHz range.

Building End Fed Half Wave antenna (EFHW) for 40M – 10M

 The End Fed Half Wave Antenna (EFHW) 40m – 10m antenna is one of the most popular and versatile multi-band antennas for amateur radio. It requires only a single support, is quick to deploy, and offers excellent performance across the 40m, 20m, 15m, and 10m bands. This design is perfect for operations like POTA (Parks on the Air) or SOTA (Summits on the Air), or simply for hams with limited space.

Building End Fed Half Wave antenna (EFHW) for 40M – 10M:

VHF Collinear J-Pole : The DIY Super J-Pole Antenna

VHF Collinear J-Pole : The DIY Super J-Pole Antenna: Take your VHF/UHF station to the next level with DIY Super J-Pole guide. Learn how to build this collinear antenna for maximum gain and clear long communication

94-Foot Multi Band Doublet Antenna – Simple All-Band HF Wire antenna

94-Foot Multi Band Doublet Antenna – Simple All-Band HF Wire antenna: This antenna is not fancy. It uses no traps, no coils, and no complicated matching networks at the feed point. What it offers instead is clean, balanced operation and very low loss, especially when compared with multiband antennas fed only with coax. Many operators who try a doublet for the first time are surprised at how alive their receiver sounds and how easily contacts are made.

Near Vertical Incidence Skywave (NVIS): The Definitive Guide to Reliable Regional HF Radio

Ever wonder why your HF signal skips over the next town but hits the next continent? 🌎

Master NVIS (Near Vertical Incidence Skywave) to close the gap! Perfect for regional nets and emergency comms when the repeaters go down.

Check out the definitive guide here: 👇 https://vu3dxr.in/near-vertical-incidence-skywave-nvis-the-definitive-guide-to-reliable-regional-hf-radio/

#HamRadio #RadioOperator #NVIS #VU3DXR #AmateurRadio

Near Vertical Incidence Skywave (NVIS): The Definitive Guide to Reliable Regional HF Radio

Near Vertical Incidence Skywave (NVIS): The Definitive Guide to Reliable Regional HF Radio: Learn how NVIS (Near Vertical Incidence Skywave) enables reliable short-range HF communication, including propagation, frequencies, and use cases.

Extended Lazy-H Antenna: A Classic Multiband Wire Design from QST

Extended Lazy-H Antenna: A Classic Multiband Wire Design from QST: The Extended Lazy-H antenna, introduced in QST in 1955, is a balanced, open-wire-fed HF antenna offering efficient multiband operation.

The Extended Lazy-H antenna is one of amateur radio’s classic wire antenna designs, combining simplicity with reliable multiband performance. First published in the October 1955 issue of QST magazine, this antenna was intended to provide efficient HF operation using balanced construction and open-wire feed line.

Despite its age, the design remains practical today and continues to perform well when paired with modern ladder line and antenna tuners.

Half Loop Antenna for 80, 40, 20, and 15 Meter Ham Radio Bands

Half Loop Antenna for 80, 40, 20, and 15 Meter Ham Radio Bands: Learn how to build and use half loop antenna for 80, 40, 20, and 15 meter ham radio bands. Simple design, multiband performance, and practical installation tips.

The half loop antenna is a practical and space-efficient solution for amateur radio operators who want reliable multiband HF performance without complex matching networks or large towers. The design shown above is a proven configuration that supports 80, 40, 20, and 15 meter bands, making it ideal for both regional and DX operation.

How to Build a Reduced Size 40M Antenna – Complete DIY Guide

How to Build a Reduced Size 40M Antenna – Complete DIY Guide: Build a compact reduced Size 40M Antenna using PVC spacers and simple materials. Get full measurements, design diagram, assembly steps, and tuning tips

Morgain Antenna: Dual-Band Dipole that Beats Traps

Ditch the Traps, Keep the Gain!

Tired of losing signal power to bulky antenna traps? The Morgain Antenna is the compact, dual-band secret every Ham needs to know. This clever design offers high efficiency by eliminating lossy traps, ensuring more of your power actually hits the airwaves.

Operating at roughly half the length of a standard dipole, it is the perfect space-saver for small yards while providing excellent performance on the 40m and 80m bands. Best of all, its simple wire construction makes it low-maintenance and highly durable against the elements.

Stop compromising your signal in small spaces. Learn how to build this "trap-beater" and boost your station's performance today!

Morgain Antenna: Dual-Band Dipole that Beats Traps: Build high-performance HF Morgain antenna with accurate dimensions and simple construction. Complete guide with diagrams, spacing, materials, and tuning tips.

1:49 UNUN using two stacked FT240-43 cores for endfed halfwave antenna

1:49 UNUN using two stacked FT240-43 cores for endfed halfwave antenna: 1:49 UNUN is a type of transformer that can be used to match an end fed half wave antenna to a 50 ohm coaxial cable. It is made from two stacked FT240-43 cores.

Rothammels Antenna Book – Translated and revised from the 13th German edition

Rothammels Antenna Book – Translated and revised from the 13th German edition: Rothammels Antenna Book - Translated and revised from the 13th German edition makes even constructive solutions accessible to more radio enthusiasts

Full Wave Loop Antenna for VHF, UHF & FM Radio Bands

Full Wave Loop Antenna for VHF, UHF & FM Radio Bands: Learn how to construct a DIY Full Wave Loop antenna for 145 MHz, 435 MHz, and FM bands. Includes precise dimensions and a step-by-step build guide.

DIY Moxon Rectangle Beam Antenna for 10m, 15m, and 20m Bands

DIY Moxon Rectangle Beam Antenna for 10m, 15m, and 20m Bands: Master the DIY Moxon Rectangle Beam antenna. Detailed guide on dimensions, design, and calculations for 14MHz, 21MHz, and 28MHz ham radio bands.

Terminated End Fed Vee Antenna (TEFV)

It is a travelling wave antenna, which has a constant current distribution along its length. Antennas usually used by radio amateurs are resonant standing wave types like dipoles. It is built to a specific tuned length so that a standing wave is set up on the antenna element. This is efficient and narrow band, only works on the fundamental frequency. In a travelling wave antenna there are no standing waves on the antenna element as the power that would be reflected back from the end of the antenna is absorbed by the terminating resistor. Typically this is 25% of the power applied to the antenna.

The polarization of the TEFV ( Terminated End Fed V Antenna) is a mixture of vertical and horizontal that results in a kind of elliptical polarization. The main advantages of terminated end fed V antennas are its broadband nature and no tuner requirement. It provides a non-resonant antenna with exceptionally wide bandwidth, matching a 50 ohm coaxial cable transmission line with a VSWR of less than 2:1 from 1.8 MHz to 30 MHz.

The critical parts in TEFV antenna are 9:1 unun transformer and terminating resistor. Main problem was in constructing 9:1 Unun with correct size wire for windings. Winding with wrong wire size resulted in poor impedance transformation and high through loss. The resistor value should be 10% higher than the transformer output impedance. So for a 9:1 transformer (50 ohms to 450 ohms) the termination should be 500 ohms

Terminated End Fed Vee Antenna (TEFV): Terminated End Fed V Antenna (TEFV) - It Is a travelling wave antenna, which has a constant current distribution along its length.

40m Vertical Antenna: Compact Base-Loaded Design for Powerful HF Operation

The 40m vertical antenna is one of the most effective solutions for amateur radio operators who want strong DX performance without needing a full-size tower or large open yard. The 40-meter (7 MHz) HF band is prized for its reliability—offering both daytime regional communication and long-distance propagation at night. Yet, a full quarter-wave vertical requires around 10 meters of height, which can be impractical in residential areas.

That’s where a base-loaded 40m vertical antenna comes in—shortened to just 3.4 meters tall, it uses a coil at the base to achieve electrical resonance, allowing operators to enjoy 40m contacts from almost anywhere.A practical solution is a base-loaded vertical antenna, which uses an inductive loading coil at the base to achieve electrical resonance with a shorter radiator. The design shown above, originally credited to PY7NQ, is a compact yet efficient vertical antenna optimized for 40m HF operation.

This antenna is a base-loaded quarter-wave vertical for 40m, physically shortened to just 3.4 meters in height. The missing electrical length is compensated using a loading coil placed at the base.

40m Vertical Antenna: Compact Base-Loaded Design for Powerful HF Operation: 

Build Your Own Multiband G5RV Antenna: A Classic Ham Radio Project

📡 Build your own classic Multiband G5RV Antenna and work multiple HF bands with a single wire setup! Simple, effective, and perfect for both beginners and seasoned hams. A great DIY project to boost your station and explore the airwaves. 🌍🔧
👉 Get the guide here: https://vu3dxr.in/build-your-own-multiband-g5rv-antenna-a-classic-ham-radio-project/

#HamRadio #G5RV #DIYantenna #AmateurRadio

Terminated Mini Loop Antenna : Small Space Ham Radio Antenna

What Makes the Terminated Mini Loop Special?

The terminated mini loop antenna combines elements of loop and terminated designs to achieve directional reception with reduced noise pickup. Unlike large loop antennas that require significant space, mini loops are designed for constrained environments while maintaining directional characteristics through resistive termination.

These versatile antennas typically range from 30 inches to 30 feet in diameter. They can be shaped as squares, diamonds, or triangles depending on your space requirements. The compact size makes them ideal for urban settings, balconies, or rooftops where traditional antennas won’t fit.

Terminated Mini Loop Antenna : Small Space Ham Radio Antenna: The Terminated mini loop antenna is a relatively simple antenna to construct. It can provide the user with wide/multi band access.

Tree Mounted Quarter-Wave Vertical Antenna

Tree Mounted Quarter-Wave Vertical Antenna: Technical explanation of a tree-mounted quarter-wave vertical antenna using only two sloping radials. Covers working principle, feed impedance and construction,

The vertical antenna shown is a ¼-wave vertical radiator suspended from a tree with only two sloping radials instead of the conventional three or four. This is a practical field-expedient configuration often used by portable and emergency operators where space or support is limited.

Unlike a classic ground-plane that relies on multiple radials to form a symmetric RF ground, this design uses two opposing radials to provide the necessary return current path and impedance transformation. A vertical quarter-wave radiator forms one half of a dipole. The missing half is replaced by a current image in the radial system.

Building the FBK Sleeve Antenna for VHF/UHF Amateur radio

Building the FBK Sleeve Antenna for VHF/UHF Amateur radio: Build a compact dual-band FBK sleeve antenna for VHF/UHF bands from coax cable. Simple, efficient, and ideal for portable ham radio use.

The FBK Sleeve Antenna is a coaxial-based antenna that requires minimal materials and can be quickly assembled for field use, emergency communication, or portable operations. Unlike a traditional whip or dipole, the FBK design hides much of its structure inside the coax itself, using precise sections of the braid and dielectric to act as radiating and matching elements.

Hotel Antenna for 2 Meter and 70 Centimeter Amateur Bands

Hotel Antenna for 2 Meter and 70 Centimeter Amateur Bands: Compact Hotel Antenna design for 2 meter and 70 cm amateur radio bands. Includes dimensions, working principle, installation tips, and performance details.

The Hotel Antenna is a clever space-saving vertical antenna design popular among VHF and UHF amateur radio operators. It is especially useful for radio amateurs living in apartments, hostels, or temporary locations where installing large outdoor antennas is not practical. Despite its compact and folded physical shape, electrically it behaves like a classic half-wave vertical dipole with excellent impedance matching and a clean radiation pattern.This  VHF Hotel Antenna, also commonly described as an end-fed vertical dipole with an offset (Z-shaped) feed section.

Building a Double Bazooka Antenna for HF and VHF Ham Bands

Building a Double Bazooka Antenna for HF and VHF Ham Bands: Learn how the double bazooka antenna works, why it offers low noise performance, and how to calculate accurate lengths for HF, VHF, and UHF amateur radio bands.

Hourglass Loop Antenna : A Stealthy Performer for VHF and UHF

Hourglass Loop Antenna : A Stealthy Performer for VHF and UHF: Build the KE4ERO Hourglass Loop antenna for VHF and UHF. Includes a detailed dimension table for 144 and 432 MHz, material lists, and ham-friendly tuning tips.

80 meter 1W QRP Transmitter with Ceramic Resonator Control

80 meter 1W QRP Transmitter with Ceramic Resonator Control: 80 meter 1W QRP Transmitter with Ceramic Resonator Control delivers 1 watt of power across the 80-meter band (3.52 to 3.59 MHz) with frequency stability

Microphone Preamplifier with Diode Clipper for SSB Transceivers

Microphone Preamplifier with Diode Clipper for SSB Transceivers: Learn how to build high-performance microphone preamplifier featuring a diode clipper. This guide breaks down transistor stage and 1N914 limiting mechanism.

In the world of amateur radio (RF) and DIY audio, getting a “clean” signal is often a game of balance. You need enough gain to make your voice heard, but you must prevent over-modulation which leads to distortion. The circuit provided is a classic solution: a single-stage preamplifier coupled with a parallel diode clipper.

J-Pole Antenna Using 300 Ω TV Ribbon Line

J-Pole Antenna Using 300 Ω TV Ribbon Line: Simple 300 ohm twin-lead J-Pole antenna for 2-meter ham radio. Lightweight, no radials, easy to build, and ideal for portable, emergency, and home use.

The J-Pole antenna made from 300 Ω TV twin-lead is a simple, lightweight, and very effective antenna for VHF operation, especially for the 2-meter amateur band. With no ground radials required and an easy feed arrangement, this antenna has become popular for portable use, emergency setups, apartments, and antenna-building events. The attached diagram illustrates a proven design that has been successfully built and tested by many amateurs.

Twin-Lead J-Pole Antenna for VHF and UHF Amateur Radio

Twin-Lead J-Pole Antenna for VHF and UHF Amateur Radio: Twin-lead J-Pole antenna explained with construction details, dimensions, feed method, and performance for VHF and UHF amateur radio applications.

Multiband Dipole Antenna for 10–80 Meters

Multiband Dipole Antenna for 10–80 Meters: The Multiband Dipole Antenna shown in the attached diagram is a practical and space-efficient solution for amateur radio operators who want to operate on multiple HF bands using a single wire antenna. This design covers 10, 11, 15, 20, 40, and 80 meters, making it ideal for limited-space installations such as rooftops or small yards. Instead of using multiple dipoles or traps, this antenna relies on symmetrical loading coils and a matching section to achieve multiband operation.

3 x 5/8 Collinear antenna for 435 MHz UHF Band

3 x 5/8 Collinear antenna for 435 MHz UHF Band: High gain 435 MHz UHF collinear antenna design using three 5/8-wave radiators and inductive phasing. Ideal for UHF repeaters with 6 dB gain

VHF Collinear J-Pole : The DIY Super J-Pole Antenna

VHF Collinear J-Pole : The DIY Super J-Pole Antenna: Take your VHF/UHF station to the next level with DIY Super J-Pole guide. Learn how to build this collinear antenna for maximum gain and clear long communication.

If you’ve spent any time in the ham radio world, you know the standard J-Pole is a reliable “workhorse.” But what if you need more “reach” without switching to a complex directional Yagi? Enter the VHF Super J-Pole.

When it comes to omnidirectional antennas, the standard J-Pole is a legendary starter project. But for those who want to push their signal further toward the horizon, the Collinear J-Pole (often called the Super J-Pole) is the ultimate upgrade.

By stacking radiating elements and using a clever “phasing” technique, this design provides a significant gain increase over a standard dipole or J-pole, making it a favorite for builders who value efficiency and distance..