I think they might be practice drones. I went to the address given in the news story, 56th Avenue and Clay Street, on Google Maps Street View. There are two large open field-like areas nearby, which are surrounded by homes and businesses. Nothing mysterious. Looks like a good place for testing drones, flying kites, and playing with remote control airplanes. But there are some high tension towers to the north.
Right. They’re drones. I posted a link at post 11 that explains what they are but apparently no one bothered to look at it.