You're close Steve! You still need 2 RG6 cables for each satellite though. If you had one tuner looking for a program on a clockwise polarized transponder, while a different tuner was selecting a program on a counter-clockwise polarized transponder of the same satellite, there would be a conflict.
Now this is what I'm not at all sure of. I'm hearing that some HD programming might be coming off of a third bird without increasing the cables needed to 6. The output of that LNB is above the upper limit of the 950-1450 MHz of the other LNBs so it can be multiplexed on the other cables. An in-line unit at the tuner can let the 950-1450 MHz in and let tuning voltages and switching frequencies out. But it can also, supposedly, accept another unique signal from the tuner. This signal triggers the inline unit to block the original 950-1450, and do another block down conversion on the higher frequency signal.
Joe
