I have DirecTV, and since they really dont offer HD locals for the Hartford area yet, I use one of those "clip on a dish antennas" for my network HD.
Keep in mind, this isn't analog, so picture quality will NOT be an issue at all. Once you get a good, usable signal the picture is fantastic. Plus you usually get all sorts of little sub channels, like "The Tube" a 24-hr music video channel and some localized weather channel type stuff. Best of all, its free.
if you go here, and put your address in, it will tell you all the OTA channels you can pick up with the different types of antennas you will need to pull them in.
I get all the major networks, as well as the CW, and even a Telemundo channel. Hartford has no local PBS broadcasting in digital yet, which sucks, but I can pull in one from Springfield, MA as well as thier HD ABC and NBC stations.
“The very existence of flame-throwers proves that some time, somewhere, someone said to themselves, you know, I want to set those people over there on fire, but I'm just not close enough to get the job done.” -George Carlin