Your #1 Source For New & Used AV Equipment. Listen Technologies LA-122 Universal Antenna Kit in Original Box (1621-53). Complete with antennas for both 72 MHz nd 216 MHz systems, the LA-122 Universal Antenna Kit gives you a single solution for your venue’s remote antenna needs. Included mounting hardware allows the antennas to be attached to walls, mounted on eletrical boxes, installed on a horizontal surface, or even inside a wall or ceiling. To see our Feedback. Musical Instruments & Gear.