Diamond Original SRH519 HT/Scanner Antenna The Diamond SRH519 is an HT antenna for 2 meters and 440 MHz. It is 8.5 inches (21 cm) tall. This flexible antenna is black. Gain is a 3 dBi and it can handle up to 10 watts. This antenna terminates to a 50 ohm SMA. It is also very effective as a receive antenna for these bands. 150, 300, 450, and 800 MHz. DIAMOND 144/430 MHz. Dual-Band Flexible Slim Handheld Antenna, RX: 150/300/450/800 MHz (Gain: 0/3dB , Max Power: 10 Watts, Length: 7.75") SMA