Okay, I was reading that the pixelated/blockiness problem with action in the Olympics could be due to NBC's use of multicasting which decreases their bandwidth (apparently -- I'm very new to this if you couldn't tell so I'm throwing around terms without really knowing what they mean).
I watched part of the football game last night and it seemed a little better. It still breaks down into a pixelated display during heavy action but not nearly as bad as the Olympics. The signal for ABC was slightly less at 88% while the olympics were at 91%. I used the antenna site to get a listing but haven't used a compass to tune my direction yet. I'll do that as soon as I find my compass or buy a new one.