Yes, if other antennas are on the tower series feeding does require some
big RFC. Mine are typically 75 to 100 feet of coax or rotor cable wound
on 6-inch diameter PVC forms (size originally suggested by W8JI). Some
pix at www.aa1k.us under "towers."
The advantage to series-feed in a multielement parasitic array such as
mine is it allows for quick detuning of the tower (by letting it "float"
above ground) for adjusting other elements, and for more flexibility in
using other than a central element as the driven element (so the driven
element in one configuration could become a parasitic in another, for
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