This antenna receives digital terrestrial television broadcasts and is an all-channel (13ch. - 52ch.) compatible antenna equivalent to a 4-5 element Yagi-Uda antenna. The UHF antenna US21 is a high-performance model that supports the 470-710MHz frequency band and has a gain of 3-5dB. - Model Name: US21 - Receiving Frequency: 470-710MHz (ch. 13-52) - Gain: 3-5dB - Impedance: 75Ω Thank you for viewing. I used it for about six months, but I no longer need it.