I have a superdish, running through a switch on the dish. Can I use a diplexer to add my local hd ota signal to the same cable headed to my 811 receiver? For what it is worth, i am only using two of the three lnb's, the third on the outside I took off for portable dish. Ok, as I have no movie channels, and don't use ppv. I really do not want to run a second cable down to the receiver. is there a way around this?