[rolenthedeep]

Every coax system in every house I've ever seen (in the US) has been a mishmash of cables and splitters of random length and quality, usually with unterminated branches.

That means absolutely horrid performance at RF frequencies. Cable TV is mostly okay with this poor quality, you can still get a picture from the bad signal, but it might be fuzzy or dark. I can't imagine wifi would work at all under those conditions. You'd get reflections with random phase offset, and it'd probably totally destroy the signal.

What you want is probably possible, but it would require a dedicated line to each terminal run back to a central location with no splitters. At that point, you're just running worse ethernet with extra steps.

[jakedata]

Fortunately I am working on my home, not yours. I have RG6 quad shield home runs to lots of useful places but I didn't want to pop for MOCA bridges.