You might consider using a multiswitch with a quattro LNB.
If you have several dishes that you want to combine the signals from, then get an "8 in" multiswitch which will take the quattro LNB signals from 2 independent dishes and consolidate them. Then on the output side to your receivers get an "8 out" so you have 8 cables to your receivers each one with all the signals from both dishes piped along every cable.
If you shop around on the auction site there are occasionaly "8 in 8 out" switches going cheap enough 2nd user. In addition, if you want to go triple room or quadro room later you have the feeds ready.
The Bishop