The wire needs to run in a loop, from the transmitter then back. In a normal install the wires is buried in the ground around the perimitur of the area you want covered. I have three rock walls that make up my backyard with the fourth side being a fence. I figured maybe I could just attach the wire to the top of the fence and attach the return to the bottom. Fence is about a 100 ft. long. So 200 ft. of wire total. That distance is weel withi the capacity of the transmitter. T he company hasn't been a lot of help. All they can tell me is read the manual.