Re: "Science" ?
I've always thought that it could have been a similar directed energy attack, a few kilowatts carrier at a microwave frequency to power another "Thèremin Thing"
if the microwave carrier interacts with another microwave carrier, you can have audio/sonic, due 'rusty bolt mixing' but there's also the https://i.blackhat.com/us-18/Wed-August-8/us-18-Guri-AirGap.pdf [pdf 5MB] considers Air-gap/faraday-cage room with cute plastic table & chairs, data jumping techniques ‘covert channels’ badBIOS, Fansmitters, high power infrasound, ultrasound, hypersound.
IIRC there was a described very high power piezo device transducer to get energy into a spooky diplomatic closed chamber & return data, or simply power bugs, but I seem to remember that was developed by "the good guys"
surely all spooky premises are continuously monitored from DC to light (and beyond) for any coherent/incoherent energy emanation?
Biting the hand that feeds IT
