As a HAM we use these for Meteor Scatter.. (OK, I'll Splain)
You shoot a CW (Morse Code) signal at the Shower, and you may get a VERY weak station coming back, but this is VERY fast type stuff as you might guess. Kinda Exciting when you hear this and know your bouncing a signal off a Meteor. Also Moon Bounce is along the same lines..
OK, so I added something LESS interesting to some, but it IS EDUCATIONAL and this is good, Right?