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I think you can send hdmi over coax, but at not such long lengths as HDMI. Something like these
The guy I did mine with said that coax is laggier than ethernet.
Cheers and @brun
So far as I understand the hdmi to ethernet converter doesn't change the signal at all so it needs to be a dedicated cat6 cable. I was hoping to find some way round that.
There are also coax cables to every room (although weirdly no aerial), I wonder whether I can do anything with those?