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IIRC all those S9 antennas are is a wire suspended inside a telescoping fiberglass tube and fed with a matching transformer at the bottom. When it comes to verticals I never did like a series fed vertical and very much prefer shunt fed verticals. The series fed are easier to install and tune but require much more in the way of lightning protection to make them anywhere near safe IMHO.I saw enough series fed verticals in the broadcast business and saw what was required to make them handle lightning strikes. A shunt fed vertical can be solidly tied to ground at the base and the feedpoint is at ground potential to  start off with, no static balls, no static discharge coils, nothing required at all other than the normal methods to protect any and all stations.