That information is in this thread somewhere. I know the thread is so long that it is impractical to read through at this point. If I recall, you get some fine wire from a magnet coil and add it to the end of the plane's stock antenna wire which ends on the vertical tail fin. Some add 3 inches. Some double the length. There is also a way to tune the transmitter's antenna coil, but I really don't know much about that.