fearandloathing:

 

I've given this some thought, trialling one of these https://www.matchmaster.co.nz/amplifiers-and-modulators/10mm-mt47/ I think distributing over coax is the right solution, at least for me. But the mt47 doesn’t produce a satisfactory result.  I will next be looking at something like this https://www.amazon.co.uk/Edision-HDMI-Modulator-Full-Distribution/dp/B00KBXKJ2A  I'm distributing the COAX with one of these which https://www.matchmaster.co.nz/amplifiers-and-modulators/30mm-dda28/ allows for a backfeed from the mt47.  This works great.

 

Edit changed a link to Amazon

 

 

 

A DVB-T encoder so the HDMI steam can be fed over a channel is the best approach. Whether it's cost effective or not depends on how many TV's you've got - certainly for the OP it's going to be more expensive, but is a far better solution. It's also worth noting that depending on what modulator you use and the source content that you may need a HDCP stripper as well.