DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR
Build high-efficiency magnetic loop antenna for HF. Explore DIY projects, tuning tips, and compact antenna designs for limited-space radio setups
Struggling with limited space or high local noise? The Magnetic Loop antenna is the ultimate “stealth” solution for hams. We dive deep into the PA0WIT design, featuring a 1/5 ratio Faraday loop for a perfect 1.1 SWR and peak performance from 7MHz to 18MHz.
The W8JI Super Mini Loop antenna is a compact full-wave loop design that delivers multi-band HF performance. Learn how it works, why it’s efficient, and how to build and optimize it for your stati
DIY 80 m magnetic loop antenna: 1.5 m copper tubing loop with gamma-style feed and air-variable capacitor, delivering low-noise 3.5 MHz HF performance in small areas
Can’t fit a full-sized 80-meter dipole in your backyard? Or maybe you’re tired of the high noise floor of a vertical? It’s time to look at the Half-Loop. This “open-loop” design provides a fantastic balance between the quiet reception of a loop and the simplicity of a wire antenna.
In this project, we explore a multiband Half-Loop configuration that covers everything from 80 meters down to 15 meters. We’ll discuss the radiation pattern, the importance of a good ground or counterpoise, and how to use a simple tuner to jump between bands. If you’re looking for a “stealthy” antenna that punches above its weight on the low bands, this build is for you. Let’s get that wire in the air!
The RA9SUS simple loop is a compact HF antenna covering 14–30 MHz using a 4.7 m rectangular loop and variable capacitor tuning. Ideal for balconies and small spaces, it enables efficient multiband operation without large wire antennas or ground systems
Looking for an effective HF antenna for a high-rise or apartment balcony? This practical guide from VU3DXR details the construction and performance of a Loaded Loop Antenna—a compact, high-efficiency solution designed specifically for radio amateurs facing severe space constraints.
The delta loop antenna represents one of the most versatile and efficient antenna designs for HF amateur radio operations. This triangular closed-loop antenna configuration offers excellent performance characteristics while maintaining relatively simple construction requirements. Understanding the fundamental principles, design considerations, and performance characteristics of delta loop antennas is essential for amateur radio operators seeking to […]
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. What Makes the Terminated Mini Loop Special? The terminated mini […]
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, including WARC bands. The tuning capacitor is twin gang type salvaged from old radio. The foldaway loop antenna represents one of amateur radio’s most ingenious space-saving designs, offering impressive […]
Rockloop HF antenna for 10,15,20 metre ham bands The Rockloop HF Antenna ‘s a tuned loop antenna measuring 33 feet square (10m x 10m) designed for 15m, 20m, and 30m bands.This rock loop antenna tunes to 15 meter band with 15 to 20pf,20 meters with about 30pf, and 30 meters with about 60pf, much suitable […]