VK2KCE wrote:

:
: Would it be preferable when camped / stationary to earth the vehile to a
: "ground" ground = what I am looking for is a better receive signal ?????
:
: Switching to a Dipole antenna suspended from the trees would be a Major
: step upward in performance.
:
: Mobile antennas have very low efficiency, grounding them will not improve
: that significantly relative to the dipole.
:
: KD

Efficiency doesn't even come into play in his case, being he is only
worried about receiving. As far as voltage to his radio, he already
has
more than enough with the mobile whip as is. As one mentioned, the
s/n ratio is what matters. And going to a larger vertical is likely not
to
help at all. Even switching to a dipole would not be an improvement
unless the signals are coming from higher angles, etc. IE: 75m NVIS..
There are cases where my mobile antenna outperforms my home dipoles.
But these will be cases where the distance, etc favors using a
vertical.
So anyway, the short of it is adding radials to the mobile will not
help receiving at all. And switching to a larger antenna is not likely
to
help either unless there is a reason such as a horizontal dipole
favoring
NVIS. All but the puniest mistuned receiving antennas have enough
voltage
to get an acceptable s/n ratio from any decent radio. It's like adding
a tuner,
etc to a random wire. Unless there is a specific reason for it, it's a
waste
of time in most all cases.
MK