Though our beloveds were delivered without radios, almost all of them got one as a 'dealer installed' extra, which of course came with an antenna. My car had this one on from day one, bought the car from the original owner who'd never changed it.
I later installed an automatic retractable one and have had this one for many years since. Hoping someone wants a vintage original piece to help complete their car.
The base is about 1 1/4" x 2 1/2", with a unique ridge running in the middle (the repros don't have this). It extends to about 41", which is shorter than repros also. From the profile you can see that it is beveled slightly to fit the Pantera fender in a way that'll allow it to be vertical. Neat piece.
What you see is what you get and I hope you can use it. $50 owns it, plus whatever actual shipping is to you.
PM to be the next owner.