Wi-Fi Gun DIY

antenna design, it's called a surface wave antenna. Each of the small disks is equivalent to an infinite number of wires, ends up being a disk. The small disks are called directors. The antenna is essentially a yagi. The very last disk, the large one, is a reflector, the one the inner conductor goes to is called a driven element. If you want to make it weather proof, put it inside some pvc plastic water pipe. I've found that some of the measurements have to be empirically determined.