Maybe a balloon set up for publicity, i have seen some simillar before, around here in summer we have a race wich occurs 15 miles from my house, we can see hudge publicity balloon they have in the air and attached to the ground, from my home they could be mistaken for UFO....
When zoomed in 500% it seems to have an 'energy field' surrounding it and looks like it is not round after all and has small objects protruding from the sides.
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