Dual-Band Antennas When it comes to a dual band, no rubber duck can do the job- our Dual band telescopic antenna will give from 5/8 wave to a ¼ wave. ¼ wave up on 2 meters, 5/8 wave 440 MHz, 3 from the top 220 MHz, ¼ wave down 440 MHz, 2 meter and 220 MHz. Antenna 5 1/2" down and 22" up.