DIY 300 Ω twin-lead J-pole antenna for the 2 m band offering efficient VHF performance, easy coax feed, and portable installation without radials
Tag: Antenna Projects
Explore a detailed collection of antenna projects and DIY designs at vu3dxr.in. This tag features practical builds, tuning guides, and performance tests for various amateur radio antennas. From wire dipoles to specialized SDR antennas, discover step-by-step instructions to help you construct and optimize effective aerials for your radio station.
Twin-Lead J-Pole Antenna for VHF and UHF Amateur Radio
Build a simple twin-lead J-pole antenna for VHF/UHF using 300-ohm ribbon cable. This end-fed half-wave vertical with quarter-wave matching stub delivers omnidirectional coverage, low noise, and reliable FM/repeater performance without ground radials
Multiband Dipole Antenna for 10–80 Meters
Compact multiband HF dipole covering 10–80 m using symmetrical loading coils and coax matching section. Single-wire antenna for small spaces enabling 80, 40, 20, 15, 11, and 10 m operation with an antenna tuner.
3 x 5/8 Collinear antenna for 435 MHz UHF Band
High-gain 435 MHz UHF collinear antenna using three 5/8-wave vertical sections with inductive phasing. Provides ~6 dB omnidirectional gain and low-angle radiation for repeater, base, and long-range 70 cm band operation.
20–40–80 Meter Loaded Multiband HF Dipole Antenna
Operating on 80m, 40m, and 20m from a small backyard is no longer a challenge. Learn how to build a compact, loaded multiband HF dipole that uses precision-placed coils instead of traps. This high-efficiency design offers resonant performance on three major bands using a single 1:1 balun
4:1 UN-UN Transformer for End-Fed Antennas
Build a 4:1 un-un impedance transformer to match end-fed wire antennas to 50 Ω coax. Ideal for long-wire, vertical, and off-center-fed antennas, improving SWR and RF transfer in multiband HF installations.
9:1 UN-UN Long Wire Transformer for HF Antennas
This article explains the construction, operation, and real-world usage of a 9:1 impedance transformer (UN-UN) for long wire and random wire antennas, making it ideal for SWL listeners and amateur radio operators.
5/4 Wave VHF Antenna for 145 MHz Using 450-Ohm Ladder Line
Build a 5/4-wave VHF antenna for 145 MHz using 450 Ω ladder line and a choke feed. Shows how to mount, feed, and match this high-gain vertical for FM, repeater, and simplex operations on the 2 m band
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
W5GI Multiband Collinear Antenna: A Proven HF All-Band Wire Antenna
The W5GI multiband collinear antenna combines wire radiators and coaxial phasing sections to deliver reliable HF coverage from 80–6 m. A tuner-friendly alternative to the G5RV with strong multiband performance and efficient radiation for practical ham radio installations