No, not all channels are on UHF. While Many DTV stations are occupying UHF broadcast channels, many stations are providing VHF broadcast channels as well. You can locate your Transmitter Locator page online, to find a complete list of the channels available in your area. The list will indicate your distance from the transmitter tower which broadcasts that channel, whether the channel is UHF or VHF, as well as the channel displayed on the television.