Review on AntennaMastsRus - Made In USA - 4 Inch Green Aluminum Antenna Is Compatible With Ford E-350 Econoline (1992-2021) by Mark Vazquez

Overall the antenna makes a very good impression. The black finish seems more durable than what is on the factory antenna and the helical mast wrap looks like factory, but the antenna didn't fit my truck. At least not the ones I got. The only adapter that came with the antenna had a 6mm thread on the antenna side and a 10-32 thread on the truck side. My truck needed a 1/4-20 thread to screw on the antenna. I didn't want to bother with shipping back or waiting, so I made my own adapter. Just be a buyer, be careful, you will either have to contact the manufacturer and wait for the right adapter if they have one, or take responsibility for it working.