Seesii HH-N2RS Dual Band Antenna For CAR Mobile Radio UHF VHF 400-470 136-174MHZ NMO Frequency 400-470MHZ and 136-174MHZ Dual band, high gain! Gain:2.5/3 Db Power50W Length: 9CM Can install to the antenna base station directly. Top diameter3.4CM Button diameter4CM Center Point: 144mhz and 435mhz PL259 connector connector, suitable for car mobile radio station