Thanks SO much for your quick reply! I've been panicking ever since I realized the HR20 required that dish (although I suspected as much.)
After the additional two RG6's were added last time, I weather-sealed up the entrance hole. Now I had no idea if that hole had to be bored out, or not! And inside, with those same additional cables, I re-did my whole 'Home Theater' setup, replacing 6 small metal WireMold conduits with one much larger WireMold plastic ducting.
The thought of either trying to pry open about 30 feet of that stuff OR having to fish the cables through the whole length of it, was daunting to consider!