I hope your using a multiswitch not a splitter as a splitter would have no idea on how to route power to the LNBs correctly. Can you post of very good photo of this device or find an image or link to the item online?

From the FAQ I linked to:

A multiswitch takes the input from both of the LNB's (both cables from a dual LNB dish HAVE to be connected to the multiswitch)...it then locks one of the LNB's to always look at the even transponders and the other LNB to always look at the odd transponders. This is why a multiswitch only works with Dual LNBs and not single LNB's. The switch then has multiple outputs to receivers (4,8,etc). When you connect the receiver to the multiswitch, the switch determines which of the two LNB's the receiver needs to look at depending if it needs to view odd or even transponders. When you change the channel, the switch then swaps your connection to the other LNB when needed. With a multiswitch, the LNB's never change which side they are looking at.



It seems that over 100' of cable they recommend that you use a powered/amplified multiswitch.

What is your end goal? How many tuners do you need to run? Lets say you want two HD dual tuners and two standand receivers that would mean you need multiswitch with 6 outputs.

Wait do you really only have one cable into the basement from the dish?