yeah, i stood off to the side enough so that there was no vehicle part behind it and i had someone wave the antenna back and forth, front to back facing towards me to try and "simulate" movement towards me.
it wouldn't give a speed. it just gave the distance and a "0" for the speed.
i tried some different angles and left to right, etc.. and never got a speed reading.
seeing as a vehicle is so big, the antenna isn't large enough to affect any kind of reading.
even when i went to the same side with the pillar behind it, i was usually getting the distance of the pillar when it was shaking. i had to be real precise to get it when it was still, but once it was moving it took a bit of doing to even lock onto the distance.
I would say this myth is busted.

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