When I use Antennaweb.org to determine which affiliates are broadcasting a digital signal in addition to the analog signal, I see dates that are in the future. Why?
While there are TV stations serving all markets in the United States airing digital television programming today, not all stations are available in every market yet. Most stations will continue to provide analog programming through June 12, 2009. At that point, full-power TV stations will cease broadcasting on their current analog channels, and the spectrum they use for analog broadcasting will be reclaimed and put to other uses. It may also be the case that your local stations are not yet broadcasting at full power for their digital signal. That might also explain why a station isn’t predicted to be received at your location.