Cushcraft AR-270 - 144-148/430-450 MHz 2 Meter/70cm Dual Band Vertical Base Antenna, 3.0/5.5 dbi, RINGO. The Dual Wonder AR-270 is only 3.75 feet(1.1 meters) high. It has great performance for its size, making it the most popular 2m/70 cm base antenna. Specifications: Frequency, MHz : 144-148 / 430-450 SWR 1.2:1 Typical: >4 / >15 2:1 Bandwidth, MHz Gain, dBi: 3.0 / 5.5 Power Rating, Watts FM: 250 Horizontal Radiation Pattern, Deg: 360 Height, ft(m) 3.75 (1.13) Mast Size Range, in 1.25-2 (3.2-5.1) Wind Load, square ft (m square) : 0.27(0.03) Radial Length, in(cm): 6.75 (17.1) Weight, lb(kg) : 2 (0.9).