This was found in VA. There appears to be a heating coil in the center, which is attached to and can be manipulated by (flexes in and out) the connection at the top.
I think DCMATT is on the right track with an Antenna base of some kind. so far it makes the most sense of all of the ideas. After looking at close up of the pics.
This is unfortunately not in my possession anymore. I left it with the property owner. It was found within 20 ft or so of a road, so the automotive connection makes sense.