We did this back in the ‘70s with a fire control radar dish (power off). We could speak softly or whisper across the front of the dish, and people on the deck or pier over 200 feet away could hear the voice as if it were originating right beside them (or inside their head). All it requires is a correctly shaped dish pointed at the intended recipient.
You too?! I could tell you a very humourous tale about a guy who used this same trick to get a date. San Diego Broadway pier was the location...