The previous owner of my house set up the satellite system in this way: From the round dish halfway up the side of my house, he made one cable run from LNB-1 outside up to attic and then into master bedroom (upstairs), and one cable run from LNB-2 outside down to basement and then into family room. I now have two Direct Tivo units with dual tuners and need to buy a mutliswitch so I can record one station while watching another. If I understand this correctly, I will need to buy an outdoor multiswitch because the two cable runs from the dish do not go inside to the same location. There is a 5x4 multiswitch available on hometech.com that is waterproof and powered (via a coax cable) and would seem to be what I need. My question is, do 5x4 multiswitches require four LNB inputs or can I connect my two LNBs and leave the other two inputs unused? (I cannot find a 2x4 multiswitch for sale with the same waterprrof properies.) Thanks.