The OSJ Dual-Band Antenna: An Elegant Amateur Radio antenna in a Compact Package

The OSJ Dual-Band Antenna: An Elegant Amateur Radio antenna in a Compact Package: Build the high-performance OSJ Dual-Band antenna for VHF/UHF amateur radio. This guide provides dimensions, spacing requirements and construction tips

Multiband Dipole Antenna for 10–80 Meters

Multiband Dipole Antenna for 10–80 Meters: Multiband dipole antenna covering 10, 11, 15, 20, 40, and 80 meters using loading coils and a matching section. Compact HF antenna requiring external tuner.

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

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.