Diamond MR77SMA 144/440 Mobile Mag Antenna SMA Connector DIAMOND 146/446 MHz Mini Dual-Band MobDIAMOND 146/446 MHz Mini Dual-Band Mobile Antenna w/ Mini Magnet Mount & Cable RG-58/U Length Approx. 13ft , Black, Gain: 2.15 / 3.4 dBi, Connector: SMA, Antenna Length: 20", Max Watts: 70, Magnet Diameter 2.6" SMA CONNECTOR