[Mr. Carlson] bought a Globe Scout Model 40A ham radio transmitter at a hamfest ... nor did it include crystals, a microphone, or a key. A 1955 article referenced this exact model: Globe Scout ...

Spy: A modern study of microphone bugs operation and detection talk at 34C3. You can find the slides here, and their white paper here. Focusing their research primarily on FM radio transmitter ...

You get two transmitters not one, and there’s also a mic built into the receiver which ... house wall – and radio signals can be unpredictable, but I thought that was very impressive.