VH-1225S-VHF Mobile Antenna Features: FREQUENCY : 136-174MHz(by WHIP CUT TUNING) GAIN : 3dBd V.S.W.R. LESS THAN 1.5 IMPEDANCE : 50 OHMS POWER CAPACITY : 300W STAINLESS STEEL SHOCK SPRING CONNECTION : NMO LENGTH : 137.5 cm