The quality of your communications will never be better than what the quality of your coax. Our dual lead, co-phase harness assemblies are made from our RG-59A/U, Fire-Flex coaxial cable. Designed specifically for dual antenna system configurations. Our K-9 co-phase harness utilizes two 18' (5.5m) leads. All three ends are terminated with a PL-259 type connectors to match the connector on your radio and and standard "A" type studs (eg K4A not the K4).