If you want to mount an NMO antenna to the roof of your vehicle and you don't want the mount to fly off, look no further. This is the strongest magnetic antenna mount we've seen for an NMO antenna application. This mount uses 4 x 5" magnetic bases with aluminum support arms. Once you've stuck this mount on your vehicle, you're going to have a hard time moving it around or taking it off. So make sure you get the positioning right.