"Cecil Moore" wrote
A high-Q loading coil in
the center of a vertical is much more efficient than spreading
the loading out over the entire antenna.

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Wrong! Spreading a multi-turn coil allows a MUCH thicker wire
diameter to be used with spaced turns. Also the coil diameter can be
increased to minimise the number of turns.

Result : higher coil Q, lower coil loss, greater efficiency.
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Reg.