VH-1220-VHF Mobile Antenna Features: FREQUENCY : 50-60MHz (QUARTER WAVE)144-174MHz (5/8 WAVE) GAIN : UNITY / 3dBd V.S.W.R. LESS THAN 1.5 IMPEDANCE : 50 OHMS POWER CAPACITY : 500W CONNECTION : 3/8" x 24T STUD LENGTH : 135 cm