wifi setup

Hello I think I've read so much over the past few days about different solutions to the problem I'm having that I've ended up more confused than ever :) I have an Asus AC68U inside our house, which functions great and gives good WiFi over the whole house. It's placed inside the front room...

Please forgive me ahead of time. I recently purchased networking gear- (1 AP/repeater/ router device) and desired to boost signal across 5 acres with the single antenna. lesson learned - 1 isnt enough. So now I am working on a 30 acre parcel to incorporate wifi using AP (hopefully 3 of) and...