To clarify what can be done physically or legally with DirecTV equipment, there is a difference between setting up a DirecTV off-air tuner to be able to tune adjacent market channels and changing a receiver's account status to make it part of a different DMA to enable satellite reception of those same out-of-market stations.
When DirecTV first started incorporating off-air tuners in its HDTV receivers, like the Hughes H-86 and I think the Sony Sat-100 (it had been a long time... I'm not even sure of those model numbers), it used to be that the off-air auto scan mapped al of the stations it found. Then, when they sent out software upgrades that included their "advanced program guide", the user could enter a primary and secondary area code before autoscanning, and the receiver would include any detected transmitters from either of those DMAs, but if they didn't enter that second zip code, those out of market transmitters would show up in the preliminary, actual transmitter channel frequency table, but not in the channels found list or guide.
But as far as getting an adjacent market by satellite, the spot beam carrying the local stations from the adjacent market is strong enough to be receivable but for legal reasons, DirecTV cannot authorize a receiver known to be at one physical address as part of a DMA of another zip code.
FWIW, Washington, DC standard definition locals are on transponder 18 and Baltimore standard definition locals are on transponder 26, and when you put a receiver in signal test, you can see that transponder 26 is as strong anywhere in the Washington, DC DMA as the so-called CONUS beams are. I do not know the spot beams assigned to the Washington or Baltimore high def channels, but you can find that out on lyngsat.com or elsewhere.
If you ever "move" to a address in the Baltimore DMA, you can speed up the process by informing DirecTV that you have self installed the system there and give them the address at which you want them to send the bill from now on. And since the person who will be taking over the property you will have moved out of will probably want to enjoy local broadcast HDTV immediately, before they decide what premium TV service to subscribe to, you might want to tell them that they can get their Washington DC locals just fine for free off the air.
Edited by AntAltMike - 12/6/12 at 11:12am