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.
Tag: Collinear antenna
Collinear antenna designs and DIY builds for VHF/UHF amateur radio including coaxial collinear, stacked vertical, and high-gain omnidirectional antennas
VHF Collinear J-Pole : The DIY Super J-Pole Antenna
Build a VHF Super J-Pole (collinear J-pole) antenna by stacking two half-wave elements with a phasing stub for ~3 dB gain over a standard J-pole. Omnidirectional, low-angle radiation vertical ideal for 2 m repeaters and long-range VHF communication
Simple High-Gain collinear antenna using coaxial cable
Learn how to build a simple high-gain collinear antenna using coaxial cable for VHF/UHF amateur radio. Low-cost DIY design with improved omnidirectional coverage and better range than a standard vertical
Building a Quarter-Wavelength Coaxial Collinear Antenna for 2 Meters
Quarter-wave COCO antenna design for 2 m band: stacked λ/4 coax elements with phase-reversing joins for compact high-gain VHF performance and easy DIY construction
High Gain Collinear Antenna for 145 MHz and 433 MHz Bands
Learn to build a 145 MHz/433 MHz collinear antenna with 0.64λ radiators, 0.25λ phasing stub, and direct 50 Ω feed for compact high-gain VHF/UHF stations