DIRECTV compresses some SD channels a lot. Right now, it's just a bandwith thing, they need the space for HD content, so they compress more than most providers do. I don't notice it much, but then again, I don't have and HD TVs, and my biggest screen in 27''. With an HDTV screen, you probably will notice a lot of those compression artifacts. But if you think it is abnormally bad, you may want to make sure all your cables are in good condition and that there isn't something wrong with your setup. Try calling DIRECTV if it gets too bad.