Use this connector to join two, PL-259 terminated coax cables together when additional length is required. If the back of your radio is hard to access, use a jumper (see our R-36A) from the radio and use one of the AR-4's to connect it to the antenna lead. When it becomes necessary to check or tune your antenna you seperate the two cables at the AR-4 connector and place your SWR meter in-line.