If you are using multiple receivers, a switch will likely be involved. Basically, you need one RG6 cable for each polarization of each bird that you are looking at, between the dish and the switch. You need one RG6 for each tuner in your receiver to the switch. Polarization is controlled by the DC PS/tuning voltage sent to the LNB. CW and CCW from each feed must be provided to the switch so that any tuner can select either with its tuning voltage. A tuner may also send a low frequency AC signal up the coax to the switch to select a different bird. I just have the old parabolic dish with a dual LNB and 2 single tuner receivers. In my case, it's just one RG6 from each receiver to the LNB. The tuner will switch between about 12VDC and about 18VDC to select polarization. Most of today's dishes are hyperbolic paraboloids to handle multiple feeds on the azimith axis. I think there might be a configuration ot there with 3 birds but only 4 cables needed because of some sort of FDM (Frequency Division Multiplexing)
Joe
