Bill Turner wrote:
I can't prove this but I suspect there will be very little difference.
The wavelength on 80/75 meters is so much longer than the car body that
going from a low mount to a high one will be almost unnoticeable.
Ground loss will be about the same because the capacitance between the
car body and ground is the important factor and does not depend on
where the whip is mounted.

What we found at the CA shootouts is that when the bottom
section runs closely parallel to the vehicle body, as it
does with a trailer hitch mount on an SUV, the field
strength is much lower than if that bottom section is
in the clear, e.g. mounted on the roof of the SUV. Of
course, roof mounting creates a different set of problems.
--
73, Cecil http://www.qsl.net/w5dxp