Someone here told me to grab a 4” magnet at Harbor Freight, drill out the center, and use a short 5/8” bolt. Cheap and works.I just ordered some 900mhz whips from here, we will see how that goes.
https://www.gpac-llc.com/productlist.php?category=11&secondary=33
Trimble Stuff- 450 mhz antenna's and Magnetic base with 5/8" mount
