I have a feeling that I'm not going to be any help, but I said I would post ( sorry for the delay ) and here is what I have.
This is the rear quarter of my 73 Challenger, and not much remains stock, including the antenna.
The problem is that this looks to be a "cheapy" unit, and the hole in the fender is only 1/2" in diameter, where as I believe the proper units will use a 1" hole.
So right away, I would have to say not only is the NOT a Cuda, but very well may be put in a location that is NOT correct even for a T/A