If your time is worth money, you don't want to drop your headliner or just want an option. No inexpensive, either.
I don't need one but saw an ad for these:
Many truck brands/models.
Ford SuperDuty 1999-2016 Third Brake Light Antenna Mount
I don't need one but saw an ad for these:
Many truck brands/models.
Ford SuperDuty 1999-2016 Third Brake Light Antenna Mount