I am sorry for the lack of information as I am fairly new to this grms world but yes WAYOVERTHERE is correct I am using a BTECH GMRS 50X1 the Antennas I have used were all purchased from amazon This is the last one UAYESOK VHF UHF NMO Antenna L-Bracket Vehicle Radio Antenna Roof NMO Mount Dual Band 144/430MHz NMO Antenna W/13ft/4M RG58 Coax Cable this had an SWR of 2.5 , Bingfu Vehicle Ham Radio Mobile Radio Antenna Dual Band VHF UHF 136-174MHz 400-470MHz Amateur Radio Low Profile NMO Mount Antenna for Car Truck Ham Radio Mobile Radio Two Way Radio Marine VHF Radio This one was 1.9 and lastly YS TCJ-N1 Dual Band NMO 144Mhz/430Mhz Mobile FM Transceiver 2M/70cm Antenna with 13 ft RG58 Coax Cable NMO to UHF PL259 Connector for Yaesu Kenwood HYT Vertex Icom Mobile Radios swr 2.5
Last night I looked at the Tram 1180 Dual Band NMO Mount Antenna (144-148/430-450 MHz)