Here's my situation (2 questions):
1) I have an attic antenna in Grapevine, Texas (zip 76051). I don't know what brand or model it is and it's awkward to get to. I have a DirecTV HR10-250 receiver.
The HD channels of interest to me are 4-1, 5-1, 8-1, 11-1 and 13-1.
4-1 is on frequency...