That's how I had my roof antenna installed. I shopped around trying to find 'professional' antenna installers to get someone out here really knowing what they are doing. Analyze the signal path, decide on best antenna, height, direction, etc.
Well that didn't work out. Couldn't find anyone. Ended up going with the Sling/AirTV deal to have one installed. It isn't anything great (Televes DigiNova Boss), and I had to make sure he pointed it in the right direction, but I figured worst case, I have a base mount and coax run to my media closet and I can replace with my own antenna if need be. But it's been good enough for the stations almost 30 miles away and I'm 90-100 signal quality.