Diamond SRHF10 Handy HT Antenna, 144/440 MHz, SMA, 2.75". Diamond Antenna Dual-Band HT Antennas offer a wide range of features to choose from for your handheld transceiver or scanner. Whether you need a replacement antenna or want to improve your HT's radiating efficiency and range, these dual-band antennas offer a quality solution for your needs. They come available with BNC, SMA, or SMA-female connector schemes and in antenna sizes to suit your needs. Diamond rates their antenna gain figures against 'standard' HT antennas usually delivered with a new transceiver. This antenna gain method makes it easy to see how their antennas perform as a replacement for an original manufacturer's antenna.