Thanks Rick. It is getting clearer. A did Google and this informative site came up.
http://wiki.diyfaq.org.uk/index.php?title=Structured_wiring_system
What do you think?
I think that, with so many spelling mistakes, it doesn't inspire confidence in the author.
No, certainly not. CAT cable carries data. Coaxial cable carries high frequency signals. As a minimum, you need a BALUN interface. However, I don't think that will help get TV aerial signals down CAT cable reliably. But I'm not an expert (and nor is any "electrician"). This is an extremely specialised subject. You need to employ an experienced AV engineer to design this system for you.Just a snippet. A coax coming down from the roof aerial can go into a box (splitter) and come out on Cat6 cable using the RJ45 (?) plugs? And any TV can use an RJ45 plug into the Cat6 wall socket in each room rather than a coax socket?