Well, you have to define them a little better: 8' solid WHAT (fiberglass, spun aluminum, stainless steel, etc, versus 8' mesh what brand dish, or what size holes?
The spun aluminum and stainless would likely have a bit better signal than mesh. Good enough, I don't know, but maybe another 1 db or so than a 8' not so good mesh dish.
I'm in mid-Michigan with a 7.5' SAMI mesh, Titanium c1pll, and I have NO issues at all getting the Retro mux on 113W. It's better now than on it's old transponder.