Mine's a HD PVR which needs TWO coax's from the dish, so I actually have to get two sat signals to my Sat Rec. I use the exterior Sat and Cable connections for the dish, and I use the single outlet wallplate (other end of Sat cable) and Herk's re-wire mod to access the other end of the Cable coax. It took a bit to understand the mods, but it all works great.
Your setup makes sense for a 5th wheel with the reciver in the basement, but the Lacrosse 301 has a great set up at the TV with a shelf for my Sat Rec, PlaySyation 3, and RF Demodulator, so I don't need to use the basement.
Lacrosse 301RLS Touring Edition
GMC Sierra SLT 2500 4X4
BMW F650GS Dakar
Suzuki DR350SE & Suzuki DR650SE
Specialized FSR XC Comp