In a college class we tried using rockets for transmitting. Like, the middle-school "rocket club" style rockets, a simple kit with a control board, and another

In a college class we tried using rockets for transmitting. Like, the middle-school "rocket club" style rockets, a simple kit with a control board, and another that just had a very large spool of wire a la guided anti-tank missiles. They both sorta worked. Had to get clearance from the local airport about it, actually.