Multiswitch needed
just get a standard 3x4 multswitch and plus both feeds from your Dual LNB into the two (13v and 18v) inputs, and wire 2 cables each to each tivo from the multiswitch. Easy. Good brands are Perfect Vision, Steren, Pico, Channel Master, even RCA. You can go to Circuit City. Best Buy, even Radio Shack. VERY EASY setup.