[QUOTE=Jonathan_hughes76;385313]Cablecom runs on <850 MHz

You can combine the satellite IF feed (>950 MHz) and the Cablecom feed

HOWEVER if you do this with a cheap and nasty splitter, you run the risk of creating interference to all users in the same building, due to the signals mixing and intermodulating with each other.

A spectrum analyser is required to see the effect.

The proper way to do what you want is with a combiner / amplifier, which has specific filtered inputs for cable TV and for satellite TV.

We have one in our house - although not being used as per your wish.

You best bet is to talk to a satellite installation company who specialise in apartment blocks - they will have the necessary kit for the job.