Actually what you need is a diplexer. It looks just like a splitter, but allows power to pass. There is 18VDC passing between the receiver and the dish outside. You will have the one wire from outside (connected either to the dish or the cable tv). On the inside, take the wire from the outside and run it into the diplexer (side with a single input). Then run 2 wires: there is a side on the diplexer/splitter that says "power pass". This connector/wire goes to "sat in" on the receiver. The other side, run a wire to "ant in" on the receiver.
I don't think an A/B switch will pass the power needed.
bob
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