First, cut two parabolic curves from cardboard, and cut a hole at the focal point of each just big enough to fit over your access point´s antenna. These curves keep the reflector in its proper shape. Next, cut a piece of cardboard roughly nine inches square, and cover one side with aluminum foil. Shape the square sheet over the two curved pieces, foil facing in, and tape everything together. Try to get the reflector to fit to the parabolic curve closely, as deviations of even a quarter of an inch can reduce its effectiveness. Finally, slide the completed apparatus over your access point´s stick antenna.