Paint them green? I have pointed out cell phone towers disguised as trees, cacti, and palms as I have driven with people. Either they insisted they were trees, cacti, or palms, or they said they did not see it, which is a bit weird, when I say "Hey! Look at that!"
They probably did not look up from their phone.
I imagine you think a tethered custom helium balloon designed to look like a flying saucer would also be conspicuous.
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