Comet 144/440/900 MHz. Tri-Band Miracle Baby Handheld Antenna (Max Power: 10 Watts, Length: 1.75") BNC. Comet Dual-Band HT Antennas encompass a wide range of features and specifications to enhance your handheld transceiver or scanner operations. Whether you need a replacement antenna or just want to improve your HT's radiating efficiency and range, each Comet dual-band antenna offers a high-quality solution to your 2 meter and 70 centimeter needs. These handheld transceiver antennas offer a variety of features, such as super-flex whips and BNC, SMA, and SMA female connector schemes, in sizes to suit your needs with gain figures respective to antenna size.