In one word, complain.
There are a million reasons this can happen,
but most come down to compression and money (cost)...
Rick Glazier
From: "Anthony Q. Martin"
Why is is that some of my hi-def channels on Charter suck royally while
others or glorious?
All of the major networks seem to do a great job, but some of the
others....like CW in my area....just plain suck. I thought perhaps my
house just has subpar wiring (actually, I think it does despite this),
but when some channels are really, really good and others are crap....
What to do about this?