High Gain Collinear Antenna for 145 MHz and 433 MHz Bands

Antenna DIY VHF/UHF

Learn to build a 145 MHz/433 MHz collinear antenna with 0.64λ radiators, 0.25λ phasing stub,…

Antenna DIY VHF/UHF

Build the Popovic dual band antenna for 2m and 70cm bands — a simple, efficient…

Pocket SI4735 Dual Core Decoder firmware upgrade adds 400 kHz waterfall, improved SSB/CW/RTTY decoding, and…

Antenna DIY HF radio

DIY EFHW antenna for 40 m–10 m: a 10.1 m multiband end-fed wire with 34…

Antenna DIY HF radio

Build the Shorty Forty — a compact 7 MHz dipole using center-loaded coils to shrink…

Antenna DIY HF

Build a compact indoor 7 MHz (40 m) HF antenna using coil-loaded wire sections and…

Antenna DIY HF Reception

Build a compact 40 m vertical antenna using a 3.4 m radiator and 15 µH…

Explore compact 40 m HF antennas including shortened dipoles and base-loaded verticals for space-limited ham…

Antenna DIY Guide HF radio

The GM4JMU shortened dipole uses loading coils to deliver full 40 m band performance in…

KV4P-HT turns an Android phone into a VHF/UHF ham radio via USB-C — an open-source…