Problem is, I have no idea how to afix a 16 foot vertical antenna to
the top
of my little four cylinder car!

Why do you need the extra large whip? A normal mobile antenna would be
quite
efficient on those bands. Thats what I'd do, if it were me...Not to
mention
my mobile antenna is good for 80-10...Give you something to do at night
when
the high bands are dead..MK