AN/PRC-160 and AN/PRC-163 Radio Operations & Antenna Theory Practice Test 2026 – Complete All-in-One Guide to Exam Success!

A counterpoise provides the RF return path when the actual earth ground isn’t a reliable or adequate reference for the antenna. It is a conducting surface or network placed at or near the feedpoint that acts as the artificial ground plane for the antenna system. With a counterpoise, the current has a proper path to return, which stabilizes impedance and improves radiation efficiency. It can be a single conductor or a set of radials laid out around the base, and in some setups it also serves as a ground reflector to shape the pattern for NVIS, boosting short-range, earth-to-sky propagation. It isn’t shielding around the feedline, a special coax, or insulating material—those don’t provide the necessary RF return or ground plane.