To do this we really need two TV networks. One is for the Satellite TV and one is for the UHF TV network. For the Sat network we need to use a Multi Switch to make the required number of Sat feeds. When using a Multi Switch make sure you use a Quattro LNB rather than a normal quad LNB. The Triax TMP range of Multi Switches go from 8 outputs to 32 outputs. For the UHF network you can use a standard TV distribution amp such as the amp we use for our Home Networking system TV extenders. These are available in 4, 6 or 16 ways. These amps have a single input for the terrestrial aerial. If a central Sky box is required then you can put the aerial into the Sky box and feed the UHF amp from the RF output of the Sky box. If you had two Coax cables to each TV location then you can use one cable for the Sat and one for the UHF. If you only have 1 cable to each TV then you need to use a combiner to combine the Sat and UHF onto the same cable such as a 340110 from Triax. You will need one for each Sat and UHF combined feed. At the TV end you will need a faceplate that splits the UHF and Sat back out again such as the Triax 304260. You will not be able to use magic eye for control of the central Sky box so a seperate IR network will be required.
If you can get away with only 8 Sat feeds in the whole system then you could use an Oct LNB and then you would need the multi switch.