Nice looking 73 Brougham NYB, I'll express the dissenting opinion that it doesn't have enough doors for my taste.
The clamp mount CB antenna was the standard back then, two set screws pinched the front edge of the trunk lid and it was easier to run the cable through the back seat and up to the dash. Anyone who looks at it should look at the damage the antenna base and set screws have done to the edge of the trunk and the dutchman panel over the years, not to mention if they did any damage to get the antenna cable down into the trunk.