"Incognito" wrote in message
news:0gZbc.70768$1I5.8473@fed1read01...
Just my experience. Today's cars seem to have a lighter sheet metal
thickness than days of yore.
I used a Greenlee punch on my 91 T-Bird.
Curses - put a dimple in the roof.
Forget the hole saw -- dimples as well with too much pressure.


Here's what I did, for a very tall and heavy antenna.
http://www.inchase.org/outflow/event...2/f5Mount.html