This is one of those tweaky little areas that I've avoided getting into all this time, but probably ought to check out before they come to take away my audiogeek membership card... :-)
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It is a hassle but I just cleaned my connections on my directv dish - all of the ones outside. I used a cheap one from Radio Shack. It made a pretty big difference on the picture and sound of my Pioneer Elite TV. In fact, I've had to recalibrate it because it is so sensitive to input signal changes. I hate doing it on my audio rig because it is such a PITA but it does make a small difference for the better IMO.