Occasionally my Diesel DoubleCab seems quiet enough (less than 50mph)
that I've thought I might actually enjoy listening to a radio station!
 However, the U.S. Military didn't specify such a luxury as a radio.
 There is an official VW Block-Off Plate in its place.  I think I can
mount a radio there without much difficulty and placing speakers is no
real problem.  However, I'm stumped on mounting an antenna.  There is
no mounting hole in the typical driver's-side front position.  The only
existing mounting hole I can find is forward of the front passenger
door.  This does not the mirror location of the driver's side hole -
it's not on the sloped portion.  Take a look:

http://www.gis.net/~southard/Projects/DoubleCabRadio.htm

This single hole is about 15mm (.60") in diameter.  Do they still make
those old universal swivel-types that have a butterfly-wall-anchor-type
 mechanism?  I really don't want to drill any new holes.  I'm happy to
use something universal.  Anybody have any suggestions?

Maynard
'86 DoubleCab Diesel "Col. Potter"
'02 EV GLS "AMPvan"
'00 Golf GLS TDI "WooHoo"
'82 Westy Diesel "Reinhardt"