I am trying to build a rc dummy launcher for dog training purposes. Im looking for a transmitter and reciever system that has the ability to control 4 different launchers within 100 yards of transmitter in various locations. I would like the transmitter to also be a remote with only 4-6 buttons. The receiver needs to signal a servo to release the launcher. The only transmitters I've seen like this are the fireworks remotes. I don't know these systems well enough to know which transmitters can control which receivers. Any help with this would be greatly appreciated. Please bare with me as I'm trying to learn more about these systems. I would also be interested in any suggestions for books/videos that could help me learn more