Had an interesting experiment about a week ago with two identical lengths of cabling from the cable TV trunk line on the street to my house, maybe about 80-100 feet in length. One was high-grade RG6QS, the other was RG11 (the next puppy up from RG6).

The signal strength coming out by my house was 1db higher on RG11 vs RG6 on the low television frequencies, but it was a whole 4db higher on the upper frequencies (where digital cable resides). I assume the gap would increase even more were we talking about satellite frequencies.

I shudder to think what the loss would be using an RG59 line...