How LRAD Went From a Pirate Deterrent to a Police Crowd-Control Tool

It's possible this could be fought by building a fairly large corner-cube retroreflector and aiming it at the source of the sound.  While that might not be precise, it would send a lot of sound back to the area around the emitter.                            Jim Bell https://www.thedailybeast.com/how-the-lrad-went-from-a-pirate-deterrent-to-a...