Yu need two point to point wifi transmitters. About $60 each. You program them and point them at each other up to 15 km away . But they need line of sight which means they have to see each other. Even if it takes a laser or a scope/telescope to line them up . I set them up all the time.Then on each end you would put them outside mounted on a wall roof or pole. the cable into the house . Then Ito yur router /computers.Any homemade antenna boosters are junk. You need these point to point devices. Some wifi routers can be used for this purpose as well. They function as both point to point and wifi hotspot . Get one of those, but they are a little more. Enjoy.