I am working on a job at the moment which has quite a flash bit of kit going in.
I am doing the work and getting "instructed" by a custom installer so I am learning on the fly...
Right now I have to run 2 x Cat 5e + 2 x coax cables from each tv location to a "server room" . The Cat 5e is used to distribute the HD tv signal and the coax cables are for either Sky or Freeview (and terrestrial tv for now).
I then also have to run another Cat 5e to each room from the server room, which is for the computer network, phones etc. It uses the equivalent to a quadriplexer, it sends all the info down 1 x Cat 5e and then splits it all up again in the room.
There are 8 x coax cables going from the 2 x Sky dishes to the server room. This gives them the option of 1 x Sky HD (uses 2 x coax), 1 x Sky + (uses 2 x coax) and 4 x single Sky boxes. There are also common DVD players, audio distribution, NAS units with their music and movies stored on it. This is also linked to CCTV and access control,
There is a coax going from the TV aerial, FM aerial and DAB aerial to the server room and there may also be a couple for Freesat.
If you want more in depth info regarding AV distribution buy a book called "Smart Homes For Dummies" or look on AVForums.com
There is a lot to AV distribution and future proofing a house! The quote for the AV install and associated TVs and distribution equipment was over £150k!!!!! Unfortunately I won't see a penny of that