James wrote:
As for a J-Pole, I really don't think that is a high-gain antenna , is it ?
My thinking has been that it is primarily a dipole, mounted vertically.

A 1/4WL is not a high-gain antenna either. Neither
is a 5/8WL with a non-optimum ground plane. A J-Pole
has essentially the same radiation pattern as a
1/4WL ground plane but it doesn't need a ground
plane. If you want gain and are willing to provide
an optimum ground plane on your ATV, then there are
phased-array gain antennas available, e.g. the
Diamond 97 inch NR22L with an advertised gain of
6 dBd.
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73, Cecil http://www.w5dxp.com