20–40–80 Meter Loaded Multiband HF Dipole Antenna

20–40–80 Meter Loaded Multiband HF Dipole Antenna: 20–40–80 meter loaded multiband HF dipole antenna design using loading coils and a 1:1 balun. A simple, space-saving HF antenna for amateur radio operators.

4:1 UN-UN Transformer for End-Fed Antennas

4:1 UN-UN Transformer for End-Fed Antennas: Learn how to build a 4:1 UN-UN transformer Construction and Working - using a T200-2 toroid for end-fed and long wire HF antennas with clear wiring explanation.

A 4:1 UN-UN (Unbalanced-to-Unbalanced) transformer is a versatile impedance-matching device used in many different antenna systems, not just end-fed wires. The diagram above shows a classic broadband design using a T200-2 toroidal core with bifilar winding, suitable for a wide range of HF antenna applications.

9:1 UN-UN Long Wire Transformer for HF Antennas

9:1 UN-UN Long Wire Transformer for HF Antennas: A detailed guide to the 9:1 UN-UN long wire transformer, explaining its design, connections, grounding, and HF antenna performance.

Most "random wire" antennas aren't actually random—they’re high-impedance headaches. If you’ve ever struggled to get your internal tuner to "bite" on 40m or 80m, you need a 9:1 Unun.

VU3DXR just dropped a deep-dive guide on this essential transformer. It’s not just a wiring diagram; it’s a masterclass in:

• The "Why": How to turn $450\Omega$ into a radio-friendly $50\Omega$.

• The Build: Winding a T-200-2 core for 400W of power handling.

• The Reality Check: A look at actual efficiency losses (and where this antenna shines).

If you do POTA, SOTA, or just love a "stealth" backyard wire, this is a must-read.

🔗 Build yours here: https://vu3dxr.in/91-un-un-long-wire-transformer-for-hf-antennas/

#HamRadio #DIYAntenna #9to1Unun #HomebrewRadio #POTA #SOTA #RadioGeek

5/4 Wave VHF Antenna for 145 MHz Using 450-Ohm Ladder Line

5/4 Wave VHF Antenna for 145 MHz Using 450-Ohm Ladder Line: High-performance 5/4 wave VHF antenna for 145 MHz using 450-ohm ladder line. Simple construction, good gain, ideal for 2-meter FM and repeater work.

3-Element Yagi antenna for 70cm UHF band

3-Element Yagi antenna for 70cm UHF band: Compact 3-element Yagi antenna for 70cm UHF band using folded dipole driven element, offering good gain, direct 50-ohm feed, and clean directional performance.

Are you looking to boost your signal on the 70-centimeter band? Do you want to hit that distant repeater or perhaps even try your hand at satellite communication? Look no further! The 3-Element Yagi antenna is a fantastic project for any radio amateur looking for a reliable, high-gain directional antenna that’s surprisingly straightforward to build.

Yagi-Uda antenna (often just called a “Yagi”) is a directional antenna that uses multiple passive elements alongside a single driven element to achieve significant gain and directivity. This means your signal goes where you want it to go, rather than scattering in all directions, making it perfect for targeting specific stations or repeaters.

This particular design is a finely tuned beast for the UHF (Ultra High Frequency) band, specifically optimized for the popular 430-440 MHz segment used by amateur radio operators.

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 detailsThe UR0GT Broadband AVIA Antenna (RW4HVN Mod) is a powerhouse for radio enthusiasts who need consistent performance across a wide frequency range. This modified design takes the classic AVIA antenna to the next level, offering incredible bandwidth without sacrificing gain.

Why this antenna stands out: 🚀 True Wideband Performance: Covers a massive chunk of the VHF spectrum with low SWR. 🛠️ The RW4HVN Mod: Specifically optimized for better matching and easier construction. 📡 Clean Radiation Pattern: Perfect for both local FM monitoring and long-range communication. 💎 Rugged & Reliable: A smart design that balances electrical efficiency with mechanical stability.

Whether you are into Airband monitoring, amateur radio, or general VHF DXing, this antenna is a "Swiss Army Knife" for your mast!

Dive into the technical specs, dimensions, and build guide here: 👉 https://vu3dxr.in/ur0gt-broadband-avia-antenna-rw4hvn-mod-the-ultimate-wideband-vhf-antenna-guide/

#HamRadio #AmateurRadio #AntennaDesign #VHF #Airband #DIYAntenna #RadioDXing #BroadbandAntenna #RW4HVN #UR0GT

ZED Dipole Antenna – A Simple and Smart Design for VHF/UHF

ZED Dipole Antenna – A Simple and Smart Design for VHF/UHF: FBK Sleeve Antenna (VHF/UHF)

Building a reliable antenna doesn't have to be complicated! 📡✨

The Zed Dipole Antenna is a game-changer for VHF/UHF enthusiasts. Known for its "simple and smart" design, this antenna is perfect for DIYers who want high performance without the headache of complex builds.

Why you’ll love the Zed Dipole: ✅ Simple Design: Easy to construct with minimal materials. ✅ Dual-Band Capability: Optimized for both VHF and UHF frequencies. ✅ Smart Performance: Offers great gain and a low SWR, making it ideal for base stations or portable field ops. ✅ Budget-Friendly: Get professional-grade results using affordable components.

Whether you're a seasoned Ham or just starting your radio journey, the Zed Dipole is a must-try project for your shack.

Check out the full build guide and technical details here: 👉 https://vu3dxr.in/zed-dipole-antenna-a-simple-and-smart-design-for-vhf-uhf/

#HamRadio #AmateurRadio #AntennaDesign #VHFUHF #DIYRadio #VU3DXR #RadioEnthusiast #ZedDipole #WirelessCommunication

Loaded Loop Antenna – A Practical Balcony HF Solution

Loaded Loop Antenna – A Practical Balcony HF Solution: The Loaded Loop Antenna is a clever HF antenna design ideal for radio amateurs with limited space—particularly those operating from apartments or small homes.

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

FM Bazooka Antenna for Superior FM Radio Reception (88–108 MHz)

FM Bazooka Antenna for Superior FM Radio Reception (88–108 MHz): FM Bazooka antenna for 88–108 MHz offers low noise, wide bandwidth, and excellent FM DX reception using simple coaxial construction.FM radio antenna

Slim-Jim Antenna for FM Broadcast Band reception (88–108 MHz)

Maximize your FM radio signal with the power of a Slim Jim Antenna! 📡🎶

If you are looking for a high-performance, budget-friendly DIY project to improve your 88–108 MHz reception or broadcast range, the Slim Jim is a game-changer. Unlike standard dipoles, this end-fed folded dipole offers a lower angle of radiation, directing more energy toward the horizon where you actually need it.

Why choose the Slim Jim?

• High Gain: Significant improvement over a standard ground plane antenna.

• Low Noise: Integrated matching section helps reduce man-made interference for a cleaner signal.

• Weatherproof & Portable: Easily house your build in a PVC pipe to protect it from the elements.

• Custom Tunable: Precision measurements for 88, 92, 96, 100, 104, and 108 MHz.

Whether you are a DXer trying to catch distant stations or a local broadcaster optimizing your setup, this guide provides the exact dimensions and wiring steps to get the job done. 🛠️📻

Check out the full technical breakdown, wiring diagrams, and frequency charts here: 👉 https://vu3dxr.in/slim-jim-antenna-for-fm-broadcast-band-reception-88-108-mhz/

#FMRadio #SlimJimAntenna #HamRadio #DIYAntenna #RadioBroadcasting #VU3DXR #AntennaDesign #TechDIY

Understanding the Bazooka Coaxial Dipole Antenna Design

Understanding the Bazooka Coaxial Dipole Antenna Design: Bazooka Coaxial Dipole antenna design explained with dimensions, theory, and calculations for 2m, AIS, 1.25m, and UHF ham bands using coaxial dipole principles.

Stacked 5/8-wave VHF Antenna for 146 MHz

Stacked 5/8-wave VHF Antenna for 146 MHz: Stacked 5/8-wave VHF Antenna for 2-meter band (146 MHz). Learn design theory, dimensions, tuning method, and original YY5RM reference for high gain ham radio

Antenna – Foldaway Loop antenna

Antenna – Foldaway Loop antenna: This loop antenna is based on one published in one of back issues of sprat by DL1HCU. It worked well with QRP power from 20-10 metres

Compact 40M HF Antennas: Short Dipoles & Short Verticals

Compact 40M HF Antennas: Short Dipoles & Short Verticals: Explore short dipole and vertical antennas for 40 m HF operation—ideal for limited spaces, field setups, and portable ham radio stations. 40M HF Antennas.

The 40-meter (40M) band is a fantastic slice of the HF spectrum, often called the “King of DX” for its ability to deliver both daytime regional contacts and nighttime long-distance (DX) communication. However, a full-size, half-wave dipole for 40M is about 66 feet (20 meters) long—a significant chunk of real estate that many urban or portable operators simply don’t have. This blog post explores various types of 40M HF Antennas like  Short Dipoles & Short Verticals.

This is where short antennas come in. While every antenna is a compromise between size, efficiency, and bandwidth, modern design techniques allow hams to get on the air on 40M even with limited space.

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

Building End Fed Half Wave antenna (EFHW) for 40M – 10M: Learn how to build an End fed half wave antenna for 40m-10m bands with detailed specifications, including the 34 uH loading coil, 1:49 UNUN balun.

W5GI Multiband Collinear Antenna: A Proven HF All-Band Wire Antenna

W5GI Multiband Collinear Antenna: A Proven HF All-Band Wire Antenna: W5GI multiband collinear antenna explained. Covers 80–6m with tuner, better than G5RV, construction details, coax sections, and real-world performance.

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.

Sleeve Dipole Antenna Design Using Coaxial Cable – A Technical Deep Dive

Sleeve Dipole Antenna Design Using Coaxial Cable – A Technical Deep Dive: Learn how a sleeve dipole antenna works. This technical guide explains the function of the radiating element, coaxial skirt, and the best dielectric materials

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.

Terminated Mini Loop Antenna : Small Space Ham Radio Antenna

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

Simple High-Gain collinear antenna using coaxial cable

Simple High-Gain collinear antenna using coaxial cable: Detailed explanation of the coaxial collinear antenna using coax cable. Learn the working principle, dimensions, construction method, and real-world performance.

Among the many antenna designs available to amateur radio operators, the coaxial collinear antenna stands out for its rare combination of simplicity, low cost, and excellent performance. Built almost entirely from ordinary coaxial cable, this antenna is capable of producing real gain over a standard quarter-wave vertical while maintaining an omnidirectional radiation pattern that is ideal for local and regional VHF and UHF communication.

Popovic Dual Band Antenna for 2m and 70cm Bands

Popovic Dual Band Antenna for 2m and 70cm Bands: Discover the Popovic dual band antenna — a simple yet efficient DIY project for 2m and 70cm operation VHF/UHF for radio amateurs

RW4HFN Balcony Antenna for the 20-Meter Band

RW4HFN Balcony Antenna for the 20-Meter Band: Discover the RW4HFN balcony antenna design for the 20-meter amateur radio band—ideal for limited spaces. Includes schematic, dimensions, and inductance values

The Ultimate DIY Guide to Setting Up a GOES-R Series Satellite Receiver for High-Resolution Weather Imagery

The GOES-R series (Geostationary Operational Environmental Satellite-R) represents NOAA’s latest generation of weather satellites, including GOES-16 (GOES East) and GOES-17/18 (GOES West). These satellites transmit high-resolution weather imagery and atmospheric data that can be received by amateur radio operators and weather enthusiasts using relatively affordable equipment.

Ultimate DIY Guide to Setting Up a GOES-R Series Satellite Receiver

 

Terminated Mini Loop Antenna : Small Space Ham Radio Antenna

Are you tired of large  antennas that dominate your backyard or balcony? The terminated mini loop antenna offers an elegant solution for ham radio operators with limited space. This relatively simple antenna provides wide multiband access from 160 to 6 meters without requiring a tuner.

https://vu3dxr.in/terminated-mini-loop-antenna/

 

Simple DIY Active Antenna for Crystal-Clear Reception

 

Tired of static on your AM or shortwave radio? Do you struggle to hear distant stations? There is a simple fix. You can build a special antenna that makes radio signals much stronger. This guide shows you how to build a DIY active antenna. It is a fun project that can give you crystal-clear reception.

https://vu3dxr.in/simple-diy-active-antenna-for-crystal-clear-reception/