OK, I seem to understand better now, too. I used to have a random wire that
was over 100' long and had the near end of it attached at the top of my
VHF/UHF antenna mast. It came down next to the mast (lead in part) down to
the radio, and I never had any problems with the mast affecting the signal.
Of course the main part of the antenna was up & away horizontal with the
mast with only 15' or so of the antenna running down the side of the mast.

If you think there might be problems with it, you could always put standoffs
on the mast and run the lead in wire down through them.


--
Tom Sevart N2UHC
Frontenac, KS
http://www.geocities.com/n2uhc