The PC78LTXFM is a dual-mode AM/FM transmit and receive CB Radio from Uniden®. The performance enhancement features include an integrated SWR Antenna Calibration system that allows the user to calibrate the vehicle’s antenna system for optimum receive and transmit performance. Additional features include Antenna Warning LED, RF Gain and Mic Gain, Hi-Cut Noise Reduction, Automatic Noise Limiter, and a PA System.