For extra clarification, this implies that the helicopter is far enough that you can’t see it and not close enough for the sound to be obvious from where it’s coming from.
In: Physics
It’s not omnidirectional. The sound produced by a helicopter is certainly directional. It might be harder to pinpoint the direction than someone shouting, but that’s generally because it’s out in the open and reflection of sound from nearby surfaces is a lot less impactful than the hit it takes from the distance from the object itself.
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