I just picked up an open box SIR-T151 and hooked up an antenna that I found in my attic. I get absolutely no signal at all. I started out trying it inside with no luck and then placed the antenna on the roof just to try an get somehing. I had my wife watching the signal strength while I moved the antenna but no luck (I have no intention of leaving the antenna up there without proper installation, just testing for a signal). Shouldn't I get at least SOMETHING? It's the antenna that I mentioned in another thread. Looks like a UHF Channel Master 4225 (Wire grid with 4 bow ties). All help appreciated. I'd like to tune in on the game if possible. Thanks.