You can also try a MoCA adapter. I've three Motorola 2.0 MoCA devices and they work great; much better speeds than WiFi albeit not as fast as Ethernet (but also without having to run Cat6 throughout the house).
Moca is like short range, high speed cable LAN. My parents house is wired for cable TV but not Ethernet. So the modem is in the basement, and a pair of moca adapters get internet up to the 2nd floor bedroom where there's a wireless access point.