I can't explain it but I have similar system! - 40+ flats, 2 dishes (Astra 2 + something else, I think - can't find the paperwork at present) + some esoteric switching/consolidation hardware (which broke at the weekend!))
Currently being upgraded to support Sky plus - i.e. twin cables to each point, rather than a single feed.
Facilities available at each (new) point - twin satellite connections, analogueTV connection - incl Freeview, FM/DAB Radio service.
Bob
XP & Win 7 + BT Homehub + BT[blackTotal ]Broadband Option 2