I have an older 18" round dual LNB satellite with 2 lines running to a 2x4 multi-switch in my house that is feeding two R10 DirecTivo's. Can I use a signal combiner to combine two of the 4 signals off of the multiswitch so that I only have to run one coaxial cable to the second R10 DirecTivo? I'd like to run only a single wire from the multi-switch and then split the signal again at the second receiver so that I can use the dual tuner functionality. Any thoughts? Haven't seen this on here anywhere.