The SCATXLOW is designed especially for UHF & Low VHF Commercial Bands, Airband , and in some cases can also be used as a transmitting antenna on the following frequencies 415MHz 4.5dBi gain, 124MHz 2.14dBi gain, 73MHz unity gain and 40MHz 1/4 wave, the SCATX is resonant at these frequencies with a SWR < 1.5:1.