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This is the technology behind 90% of Gangstalking.
HSS (Hypersonic Sound Systems) - This technology is different from V2K.
US Patent #5889870 and it's ability to create "The Ventriloquist Effect" was originally used for psychological operations during times of war and this is publicly available information.
The "Ventriloquist Effect": Because a beam can be bounced off a hard surface (like a distant wall or a building), military operations can trick individuals into believing a voice or sound is coming from a specific structure or person nearby, throwing off their situational awareness.
Not only does this technology create the very surreal illusion of Gangstalking, but it can often create the illusion of extreme danger (like footsteps outside your home and voices pretending to be armed killers).
This technology has also caused people to run for their lives in fear, often leading them to get arrested or committed to a mental institution against their will.
People new to gangstalking often run from or even attack police officers believing they are "in on it" or "trying to kill them" and it's likely that this technology is often used with the goal of getting the targeted individual arrested or committed to a mental institution.
If you believe you are a victim of gangstalking, please research this specific technology and it's ability to create the "Ventriloquist Effect". This is likely orchestrated by the highest levels of government. Don't fall for the traps set as this technology will play on your sense of sound in a very surreal way.