Sorry not to be clear about my post (was written in a hurry).
Pretty sure Ernie has grasped what I am trying to do.
I wish to send the signal from the LNB (Satellite dish) down to the receiver where it is decoded (Sky Digital) then take this decoded signal back up the same cable into an 8-way amplifier which distributes throughout the house.

The reason I am trying to do this is because the Satellite receiver was originally in one room with two cables but needs to be moved to another room with one cable (this cable currently being fed by the 8-way amplifier in the roof).
We are simply trying to avoid running another cable as access is awkward.

Sorry to be vague but satellite distribution is a fairly new area for me, although I am learning.

Thanks.