My helical is coax fed. The base of the helical is 37' in the air. If
you look at the picture in the photos section called "Feeding The
Helical", this shows the feed to the helical. The centre of the coax
feeds the helical. The braid side of the coax needs to be returned to
the earth ground system. This is done by connecting a piece of wire to
the crimp terminal on the lightning arrestor & in my case running 38'
of wire back down to one of the ground spikes.
This then lets the helical see the
earth system, the copper tank & the 120' counterpoise.
Regards,
Phil. m0vey