I am using a indoor amplified antenna, with 45db gain for VHF and 35db gain on UHF(RCA ANT1250) hooked to my Dish 811, and though I am not getting every channel, the best ones that I am getting are about 35 miles west and around 60 miles south of me with 80% plus signal strength on the CBS, NBC, Fox, WB, PAX, and a Independent channel. What is ironic is the channels closer to me (around 40 miles east) are locking in with lower signal strength.(61% to 70% for the ones locking in, but most are 49%, or not locking in)
But, it would depend on your area!
There is only two VHF DTV channels in my area (neither lock in), but I have several UHF channels that don't either and they come from the same area as the ones that do, so either I am experiencing multipathing or their broadcast signal is not strong. I don't know, so be aware of these issues, multipathing and low power!