Using Coax for LAN

[blade runner]

When I had our house re-wired back in 2009, I had the electrician put in loads of coax points (at least two for each room) as I was expecting to be running Sky throughout the house in the future. Stupidly, I ignored his advise to also put in Cat5 at the same time and am now living to regret it as the Wi-Fi signal within the house is pretty rubbish. I've tried various boosters to help, but the places in the house where I really want a good signal for streaming TV are also the furthest away from the router and often the boosted signal isn't quite good enough. What I really need is a wired connection to each room but I'm loathed to pull up all the floor boards to run Cat5 cable if I can help it. I did hear a while ago about the possibility that coax cables could be used to run a LAN which (if possible) would be ideal as I have loads of redundant coax points in each room that I've never used for Sky and never will.

Does anyone know about these systems and if so, any recommendations or advice?

[blade runner]

I've tried the powerline adaptors, but the ring main where the router is located is only one of three in the house. Upstairs and the main living area (where I want to do the bulk of the streaming) are both on separate rings, so by the time the signal has made it's way to these, the speed is so low it's of little use.

[blade runner]

Possible yes, but there's no way I'd have exposed cables on the walls!

If I have to run Cat5, then I can do it under the floor boards. I just wondered if it was possible to utilise all my redundant coax in some way seeing as it's in all the right places.

[blade runner]

Brother D said:

They are available - $70 here in the US https://www.amazon.com/Actiontec-Ethernet-Adapter-...
or http://www.dual-comm.com/ethernet-over-coax-adapte...

Assume you run coax back to a central point? Use these, then install your router or AP at the remote end where you need it - assume you don't need these in every room? So shouldn't be too expensive...

Many thanks for the links - a bit expensive, but that's the sort of thing I was hoping might be available. I'll discuss with my electician to see if this is a workable solution and likely to be fairly future proof.

If not, looks like I'll be pulling up the floorboards and running some ethernet cable. Going to need around 250m to cover all points in the house. What type/spec of cable would I be best to use if I go this route?