The Most Popular Handheld Duck Antenna High gain dual band 144/440 MHz Flexible Duck antenna. 15 3⁄4" long, its 15 1⁄2 wave on 440 MHz that gives a hearty 2.15 dBi gain. On 2 Meters you get an efficient full size 1⁄4 wave precisely factory tune for low SWR. High-Q, low loss construction. - BNC Connector See the MFJ-1717S for a SMA connector. The MFJ-1717SF has a female SMA connector that fits the popular Wouxun brand of handheld radios.