UHF Double Bazooka Antenna Construction

This article details the construction of a double bazooka antenna for the UHF band, specifically targeting 435 MHz. It describes a simple design that can be built from a length of good quality coaxial cable, intended for vertical polarization. The article provides formulas for calculating the total length of the radiating element (140.208 / F (MHz)) and the coaxial cable (99.06 / F (MHz)). Step-by-step images illustrate the construction process, starting with cutting RG213 coaxial cable, short-circuiting extremities, interrupting the braid at the center, and attaching an insulating support. It covers preparing the definitive mounting with a quality coaxial feedline (RG58 mentioned as a temporary option) and weatherproofing using PVC electrician's tube, glue, adhesive tape, or heat-shrink tubing. The antenna is designed to be mounted on a small aluminum mast, with the cable passing inside. The article reports a very satisfactory SWR measurement, with approximately +/- 3% HF return.