MJ-MJ Relay Connector M-Type Female to Female 50 Ohm Coaxial Cable Relay Connector for Amateur Radio Antenna Cable etc. Coaxial conversion connector (coaxial adapter) for relay. M Female to M Female (MJ-MJ) Compatible with amateur radios and coaxial cables. Use it to extend cables or connect teners to cables. Brand new and unused. M Type Female to M Type Female Connector (UHF Female) Connector Adapter for Wireless Antenna