If you want two dual-tuner TIVOs then you will need all 4 cables running from the dish into your suite; there is no way around this unfortunately. You cannot split the satellite signal and diplexers are used for another purpose entirely (ie: to combine cable TV or off-air RF signals with satellite signals onto one cable). Forget about putting a
multiswitch inside because you will already have one built into the dish. If you were to pull the dish apart you would find 6 cables (2 from each LNB) running into the multiswitch.
kat