Digital signals are broadcast on both Ultra High Frequency (UHF) and Very High Frequency (VHF) bands. The map tool identifies the RF channel for each station, letting you know if you need an antenna capable of receiving both bands.
The primary source is the FCC (Federal Communications Commission) . dtv gov maps
The DTV (Digital Television) Reception Map is an interactive utility provided by the Federal Communications Commission (FCC) to help consumers identify available digital signals at their specific address. It uses a terrain-sensitive propagation model to predict signal strength, accounting for hills and valleys that might block a signal from a distant tower. Key Features of the FCC Mapping Tool Digital signals are broadcast on both Ultra High