every living being, and every organ system within them has a frequency range in which they operate without issue. modify the field/frequency and things fail, go haywire, cease, overwork, or behave in a chaotic, unsustainable manner. RF, EMF can modify any target field from local (towers/fences/antenna arrays), sky(plane/drone), or space.
Add in enhanced antennae to the recipient/target, like vaccine or food supply or water carried aluminum, magnesium, iron, etc, and the effect will be more immediate, potent, and magnified.
What happened at that concert in Houston? Wuhan? Same thing?
Weapons testing for large scale area deployment.