[numberonepal]

Seems like something solid and concave (toward the machine) would redirect it right back at the user.

[HippyLoggerBiker]

“Seems like something solid and concave...”
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It should be a “Parabolic reflector” like the “Dish TV” antenna. You could ever “aim” it.

https://en.wikipedia.org/wiki/Parabolic_reflector

[alligator]

Yeah, and I wonder. If you had multiple people all doing the same thing, and directing it back to the source... would it multiply the intensity. Could you win... Overcome the operator at the source.

[OldWarBaby]

solid and concave? Yeah maybe. I was thinking conical and high velocity like, oh, say 30-06. If stupid stuff starts happening it’s poker time: I’ll see your electric toy and raise you some 30 caliber. LRAD kind of stuff could erase a lot of sense of humor.