PC-CASE 1ft Rf Connector SMA Female Panel Mount to SMA Male Coaxial Flexible Cable Rg316 30cm Used for Mobile Telephone Antennas The connector has a 50  impedance SMA is designed for use from DC (0 Hz) to 18 GHz Coaxial cable is used as a transmission line for radio frequency signals attenuation as a function of frequency, voltage handling capability, and shield quality It is also commonly used in radio astronomy, particularly at higher frequencies (5 GHz+)