Techno-woes

At home, our reception of UPN has been getting gradually worse over the past few weeks - which wouldn't be so bad if that wasn't our daily source of Simpsons episodes. Well, something seems to be causing problems with our DirecTV, and even with the help of tech support we haven't been able to figure out if it's the dish (maybe the neighbor's tree has grown this summer), the cabling, or the receiver. Unfortunately, there isn't a really fast way to check, and I don't want to disable things for more than an evening to try to figure out what's going on. Since we still have one tuner that is working, I'm not very motivated to tear everything apart either :)