I have an interesting situation regarding OTA channel reception and the 921 receiverer. I recently purchased a Windguard antenna and had it placed on my roof. I live in Howard Beach, NY, only 8.1 miles from the Empire State Building which is where HD/SD signals are being broadcasted from. Yet I'm getting "acquiring signal" and digital break-up while watching some channels and wonder if it's me or the 921? I narrowed the compass orientation to 312 degrees on the antenna as per antennaweb...Fox @44=62 signal strength. CBS @56=76 ss. ABC @45=87 ss and NBC @28=87 ss. All of the channels lock in and have been added to the guide. Yet when you tune them in, Fox and CBS display problems. It's easy to say that the problem is the signal strenght but I've read where people with as little as 50% signal strength have no problems. I also know that I can get a signal mast booster @ $100 but will I realize any improvement? My main question is "is it a 921 software problem"?