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..