AN/PRC-160 and AN/PRC-163 Radio Operations and Antenna Theory Practice Test 2026 - Free Radio Operations Practice Questions and Study Guide

VULOS refers to VHF/UHF Line Of Sight communication. This describes radio links that rely on a direct, unobstructed path between transmitter and receiver on the VHF or UHF bands. Range is limited by the radio horizon, which depends on antenna heights and terrain, so signals travel in mostly straight lines and require clear terrain or elevation to maintain the link. The other expansions aren’t standard terms used in this context, so they don’t fit the established meaning of VULOS.