ESE CA-TNCM/TNCM100 is a 100 foot TNC Male to TNC Male Cable. ESE offers Antenna Extension Cables to be used with GPS Master Clock Systems, specifically, to extend the cable run between the GPS Antenna and the Master Clock. These cables are made with RG-58 coaxial wire with an impedance of 50 Ohms. See our GPS Application Notes (also linked in the Downloads tab) for more information.