Current setup is cable TV and Internet run through a cable company provided three-way splitter (5 Mhz -1003 Mhz) TV at each endpoint, modem at one. Works fine since the cable company put in new line.

Buy some Bonded MoCA 2.0 adapters (these claim to be good for ~1Gbps) and place them at a couple strategic rooms along with 5-port switches and a standalone AP system (probably Ubiquiti). (I'd need ...