Walking Man
Those are lightening rods. . .

ruel
I THINK ITS A PROTECTOR,called lightning arrester

Kevin
They could be lightning arresting devices or fuse cutouts. Lighting arresting devices send the over voltage cause by strike directly to ground but fuse cutouts are whitesh gray rods about a foot long and the are used as over current protection, they don't distinguish outages, both of these are used as a source of protection for anything in the circuit to prevent outages

guru
It could be many things as suggested by other answers. If you are sure they are antennas they usually are yagi antennas. They provide telemetric information such as load in the area… I hope this answers your question