I have an HD receiver (Samsung) but am having trouble getting stations reliably with my antenna (standard mast type). Is this the place to ask these questions? If so, I get good reception of 8 stations (in Phoenix) when the antenna is in an upstairs bedroom. I put it in the attic directly above the room and I only get one station good and one poorly. Not only does that make no sense, it is rather impractical. (Putting in on the roof means ugly and lightning rod and dangerous climb.) Anyone with experience in this? Are the joists and other metal in the attic causing interference? What can I do?