With a two DSS receiver configuration, what is the best way to hook picture-in-picture up? Would you use the second DSS receiver for the secondary picture source? Is there somewhere that has good instructions on how to get this to work. When I had cable, Media General (now Cox Comm.) I had two cables coming in. One for the lower channels and the other for the upper channels. I could never get it to work. So now that I have Direct/TV I would like try again.