My guess is homework, otherwise, go to walmart and get a cheap toy foam plane (300-500ft high kind) at $9.95, rip out the receiver (it is glue and styrofoam) and poof you have what you need.
I used one as a water leakage detector to send a signal to the house, close a relay on the parallel port, and a PC program to SMS my phone. I can not believe how far they can transmit.
Opps. Forgot, not in the states.. But what I would do..
If that does not help, then this is homework.
AllVol: Go Gators.. Your avitar, is he standing barefoot in water puddle on the concrete floor? Kidding...