Radio Shack has a one-button remote-control car. When the power is on it goes forward continuously. When you press the button on the remote it goes backward. I believe it is very inexpensive, and could easily be used for what you are trying to do. -Adam Jon Mullen wrote: > > How would I get a radio receiver to act as a switch? When there's a > certain kind of signal, it's on. Otherwise, it's off?