'68 Dart Passenger Fender Antenna Mounting

It looks to me like the bezel can be loosened and repositioned. Maybe the upper of the 2 chrome pieces can be rotated to correct the angle, then retightened.

After more than 50 years it could have an incorrect antenna mast too.

Not all fenders were made with antenna holes in them but yours looks like it has a recess stamped into it so it's unlikely it is incorrect. I'm more familiar with 2nd gen Barracudas and there definitely is not a recess.