The Diamond RH3 is called a "Bullet" antenna because it is not much longer than a bullet! It is only 1.75 inches tall and is designed for 2 Meters and 440 MHz. It can be used for wideband receive from 120 to 900 MHz. Frankly it is not much for gain (-2.5 dB relative to stock antennas), but it is conveniently compact. It can handle up to 10 watts and terminates to a 50 ohm BNC.