my folks had DTV at their place in Vermont. I'll share their story.
When the installer came to put up dishes, we asked if we'd be able to get local channels. Was told it would need a separate satellite feed and it wouldnt work because of where the trees in the state park in their backyard were. State park meaning they cannot cut them down.
So we contact DTV to see if we can get access to national feeds for major networks (CBS, ABC, etc) since we can't get local. All this was more so we could get weather reports for the region, since, you know, VT gets a metric fuckton of snow annually and it can ruin your day. For 6 goddamn months, they went back and forth with the installer arguing that he should be able to get us reception for local channels, and the installer saying "youre fucking retarded, I've tried and it won't work".
Switched to Dish Network and we've been able to watch the OSU bowl games every year since.
Moral of the story: if DTV works flawlessly with your neighbors and there are no obvious obstructions, you're fine. If there is anything SLIGHTLY imperfect, prepare for a whole bunch of "our records show that blah blah blah nothing we can do" bullshit.