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i think a mast 1-1/2" diameter extending 8-9ft below the hoop not grounded is what avanti meant, since the measurements were taken on vhf chances are the antenna was well above ground relative to frequency,

remember what is a high impedance low current not grounded becomes a low impedance high current when grounded,
the worst case length depends on the mast been gounded or not.

[QUOTE="bob85, post: 365942, member: 18"] i think a mast 1-1/2" diameter extending 8-9ft below the hoop not grounded is what avanti meant, since the measurements were taken on vhf chances are the antenna was well above ground relative to frequency, remember what is a high impedance low current not grounded becomes a low impedance high current when grounded, the worst case length depends on the mast been gounded or not. [/QUOTE]

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