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DXing digital TV is harder (or, euphemistically, "more of a challenge") than analog. A digital signal needs to be the strongest signal on the channel (at the antenna input) if one is to have any hope of identifying it. Nearly all DTV transmitters are on channel 7 or above (sporadic-E, the propagation that allows strong reception of stations at distances like, well, from St. Paul or Albuquerque to the Florida Panhandle, is, for all practical purposes, limited to channel 6 and below).
On the other hand, Digital TV is usually identified the instant a station is seen (through the PSIP content), whereas analog stations could only be identified when they presented an ID (the old joke was that the "sporadic" in "sporadic-E" meant it ended one minute before the :00 hour).
There are articles on the internet about digital TV DX.
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