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, that's much cheaper than the HDMI over coax one I found. Only does 1080p though, will have to ponder how important that is but it's certainly an option if there isn't an ethernet solution.
@aggi started
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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.