In my area we still have the tall wood telephone poles. The highest wires are part of the electricity distribution grid. The lowest wires are larger diameter cable bundles, which I suppose are telephone cables (or possibly some other communication lines). I have noticed that between almost every pair of adjacent poles and attached to the phone cable bundle are two teardrop-shaped frames which look to be about 18" long. The pointed ends of the teardrops point toward each other, and a smaller cable is wrapped around the rounded end of them. Also, once in a while there will be a black cylindrical object about 2’ long and about 4" in diameter with a corrugated surface attached to the cable.
What are these devices and what is their function?
(I tried to google it myself but got nowhere since I don’t even know what they are called.)