20210610 Quick, Simple Repair for Broken Car Radio Antenna

This is a simple way to repair a broken radio antenna on a Chevrolet Astro without dismantling the dashboard and dealing with difficult to access wiring connections. The same method should work on many car makes and models, as it deals with a common failure mode.
It involves drilling out the broken threaded stud from the antenna mast and base, tapping new threads, making a new stud from a machine screw, and assembling the antenna base, stud, and mast.