I was reading some consumer reviews about the sony HD 200 and came across this: "the sony unit is excellent. Caution for those of you using a multi-switch setup. It took me two weeks and 2 dozen phone calls to direct TV and sony... finally TERK the dish manufacturer figured it out! The Terk 3LMB oval dish requires a direct line into the sony unit. those of you with a previous multi-switch setup(to multiple TV's in the house) must add a 3rd cable out to the dish. The TERK dish has a signal combiner and multi-switch built in the LMB unit head, and will not pass the signal from satellites B and C unless a dedicated line to the sony unit. Wish I had known this at the start" Have any of you run into this? It was of concern to me since I want to run 4 recievers (not all HD) off this dish. Does anyone know if this is also so with the Zenith HD520.