Hahahaha
As someone who plays guitar, when I read the title of this thread I was thinking of guitar amplifiers. Marshall is a well-known name in guitar amps and a stack is a type of amp set-up (usually either stack or half-stack). Another thing to note is that you can be playing guitar through an amp and then suddenly your amp starts faintly putting out music that it's electronics suddenly start picking up from local radio stations in the form of interference. It usually happens with cheaper-made amps or older amps when the wire shielding starts going bad. My old amp used to do this all the time.
So when I read the title I was like, "Wow, these drones are sure putting out some hellish interference if someone's guitar amp is suddenly picking up downlink signals from it and playing them through the amp... but how do they know it's from a drone?"
So yes, some explanation about what a 'Marshall stack' is was definitely needed.