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aggi
Stonehedge
Even Gigabit Ethernet doesn't have the bandwidth to support HDMI once you get to HD quality levels:-
1920 * 1080 * 24bits * 60Hz = 3Gbps
That's why the HDMI over Cat5 stuff takes over the entire cable.
Most TV boxes (Sky, BT TV, etc) will send the current output over a specific channel on the coax so it can be watched in different rooms by a normal telly. Modern houses are usually wired with this in mind. (You don't need an aerial but the TV boxes will also take an aerial in and add the currently watched channel to the signal so the other tellys get to watch terrestrial/freeview channels or whatever the Sky/BT-TV box is watching).