@Darrel96 You could run a wire from the router to the second property and then just use a wifi router at the other end. Depending on the size of the property this should work fine. You need to go onto the internet to see how to set up the two routers so they don't interfere with each other.
Putting the first router in the attic may be a good idea otherwise a guest switching off their wifi would get the other guests off.