Why? Because first I need to go from an Ethernet port on the router to MOCA.
Read http://www.instructables.com/id/How-to-set-up-a-coax-MoCA-network/

Now for the other end I need a WAP or router as a WAP. Google "Router as a WAP" if you don't do this much. Or https://www.actiontec.com/products/home-networking/wcb6200q/ which is not suitable for outdoors but could be just inside.

At over 200 bucks I'd try some powerline WiFi pair instead. Example:
https://www.amazon.com/NETGEAR-PowerLINE-1000-802-11ac-Gigabit/dp/B01929V7ZG/