Another (albeit, terrible) solution is HomePlug[0]. I once had broadband installed in an apartment and was provided with a couple cheap "ethernet over power" wallworts. I think the tech has improved, but they seemed to get a massive amount of interference (I think they capped out at like 65mbps?). I think I lost connections whenever the microwave was turned on.

[0] https://en.wikipedia.org/wiki/HomePlug

(edit: just noticed "ethernet over power" mentioned in another comment here. Same thing)

My houses wiring is pretty new and although my homeplug units are advertised to run at up to 500mbps, I get about 300mbps out of them which isn't terrible.

I have heard ham radio types complaining about the HF interference these devices generate.

That's very interesting, thank you.

I have the cat5e throughout the house but in a ring topology as it was wired for phones only. RIght now I just have two points connected end to end. Next step is to think of a clever way to use the 2 unused pairs to support another 100BaseT and create a fake hub and spoke topology. This G.hn standard might be a good way to get even more performance out of this setup.

Makes sense considering you can get (A)DSL over the same kind of cables.

Never knew that was a thing, i definitely need to try it out now

Where can I buy hardware for this?

Search for "Powerline" or similar on Amazon.

I was hoping for something over phone lines not power lines. Power lines tend to have far too much appliance noise.