MoCA is a way to send wired Ethernet up to (300mb/s, at least the version i have) over coax. Verizon fios would provide these devices to send internet to set top boxes over existing coax cabling, but you can get a pair of these devices and send Ethernet in on one side, and Ethernet out the other side.

I have noticed however, it adds a bit of latency to the connection, which may be trouble.