This Motorola Stubby UHF Antenna works with RDX series Motorola two-way radios. The antenna supports frequencies from 450 to 470 MHz and is removable for use with two-way radios that have a removable antenna. To attach the antenna, simply align the threads and twist the antenna in a clockwise direction until it is snug. To remove the antenna, twist it in a counterclockwise direction until it comes off.