What are the rotating dipoles I see here and there used for? I
suspect data but why not microwave? Among others, I see one on
the front of my supermarket, and four more on a pair of large
high advertising signs. I'm sure there are others if I'd look for
them. They are not very noticable.

They are about 4 - 6' long, metal, and turn about once every 5
seconds.

Any guesses?

Just curious.

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