Channels are on the VHF-Hi frequency, and channels are on the UHF The majority of indoor TV antennas are designed to pick up UHF channels. This tradeoff off is done by focusing the antenna gain, which is different from. May 19, - This antenna is a modified form of the Yagi-Uda antenna. A basic Yagi antenna consists of three sections. A reflector, a driven element and a.