Minimum screen size for HDTV?

[ChrisW6ATV]

Jeff-

Since you said your cable goes into a modulator for a DVD player, then out of that into a VCR, then out of THAT to the TV, the first thing is to turn off the power to the modulator, DVD player, and VCR, to make sure you are not getting anything from them. I do not otherwise know why the HD channels do not appear better than their SD equivalents. (All of those are among the "clear QAM" digital cable ones, right?)