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I doubt there is much, if anything, to tune. The mfr pdf seems to be
here <http://www.cometantenna.com/pdfs/gp-24%20spec%20sheet.pdf>
I can't find any "Installation Instructions". Guessing, the radials
should be fixed at some pre marked location, but this is really a guess.
The pdf has a contact at the bottom
email: mi...@cometantenna.com
<http://www.cometantenna.com> under "contact us" has this info:
NCG Companies Inc.
15036 Sierra Bonita Lane
Chino, CA 91710
Toll Fre: 800.962.2611
Phone: 909.393.6133
FAX: 909.393.6136
They made it so they should know how to install it - I'm sure someone
there can assist you.
Good luck
kc
Don't know if this is the answer you're looking for, but....
The non-radial antenna may have an internal sleeve inside that you can't
see (in a fiberglass radome?), http://inscapedata.com/OA.htm Generally, you
don't have to "tune" ground plane radials.
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