Comet Original CA-2X4SRNMO 144/446 MHz Dual-Band WideBand Mobile Antenna w/ NMO type Connector 1.5:1 or less SWR: 144-148/440-450MHz 2:1 or less SWR: 140-160/435-465MHz Gain: 3.8/6.2dBi, Max Power: 150 watts Length: 40 inches , Connector : NMO Antenna comes disassembled and does not require any tuning.