Farnsworth Airborne TV System
Farnsworth developed a system during World War Two that used television to report the effectiveness of bombing.
A bomb was equipped with a television camera and transmitter. It was released slightly after the normal bombs from a B-25 and televised the bombs hitting their targets. This allowed a visual assessment of the effectiveness of the bombing.
Here is a North American B-25 equipped with the Farnsworth. The receiver is located at the taped up portion you see to the rear of the fuselage.
A picture of the receiver.
(Thanks to Don Patterson for the pictures and information)