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I wonder if it's the zinc plated bolt that runs through the base, insulator and vertical element. It eventually corrodes. Maco has been known to leave some sharp edges on their aluminum too.

Any idea what the feedpoint impedance of a 5/8 groundplane would be? On the antenna side of the matching network of course.

[QUOTE="543_Dallas, post: 594785, member: 21044"] I wonder if it's the zinc plated bolt that runs through the base, insulator and vertical element. It eventually corrodes. Maco has been known to leave some sharp edges on their aluminum too. Any idea what the feedpoint impedance of a 5/8 groundplane would be? On the antenna side of the matching network of course. [/QUOTE]

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