mentioned before i can run cable into tv and get local hd. cable acts as antenna. i was watching a hd channel feed the other day, channel 4.1 so it was digital, not the non-hd feed and i thought the picture was slightly less crisp than usual. i mentioned it to cable tech and he said it was probably not hd. i thought digital signal is either strong enough to work or you get fuzz? will a weak digital signal produce a less crisp hd image? maybe it was 3/4 hd?