Not an antenna, it's fiber-optic tail-light sensor
Yep, that is not an antenna; it's fiber-optic tail-light sensor.
I'm not sure when they stopped adding them; but I have one my 71' Excella. It works great, and takes almost NO maintenance!
It is easily seen from the driver's side mirror; and allows the driver to check trailer tail lights before traveling AND while on the road. There are two distinct optic link fibers: one to left, the other to the right tail light enclosure. Especially at night, you can tell if tail lights are on, and even when turn-signal (or flasher) is active.
I was sorry to see that they are no longer an option.
Enjoy!
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