The item is designed to be placed in line with a 50-Ohm coax. The RF Isolator is effective from 1 to 50 MHz. It can improve the performance of all amateur stations, fixed or mobile. it will reduce or eliminate stray RF often found on coax. This stray RF can cause burns and other problems with electronic equipment in ham-shacks and vehicles. Stray RF also results in a loss of radiated power from the antenna, which will lead to a great reduction in signal strength.