It is probably fair to say that a glass mount antenna should be used as a
last resort, when no other type of antenna installation is possible,
loaned
or hire vehicle, vintage vehicle etc. A magnetic mount antenna system
usually offers far better performance all other things being equal, with
fixed antenna systems being the most efficient of all.

The external mounting point (position and design) may be subject to local
vehicle construction and use regulations relating to the security of
external fittings and risks poses to other road users.

Mike G0ULI



Mag mount antennas may be the worst way to go if you are concerned about
damage to the vehicle. A little grit under the magnet can do a lot of damage
to a paint job. The kind of damage that hurts resale value. On the other
hand drilling a hole has no effect at all, just plug the hole with a rubber
plug designed for that purpose.

Jimmie