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I bought a 510 at a hamfest...decent price ... for my repeater.? Anyway, I cleaned it up and put it back together.... 181Mhz resonance.? Tried changing some of the vertical elements... still no good!? I got a diagram for a 510HM and it's not even close.? Anyone have any info????? This thing has 3 main elements, with one of them coming apart to make it 4.

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NH6FU

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Many of these type antennas have a couple of small capacitors across a coil in the base of the antenna. They can get damaged at high power or if the antenna fills up with water. Might be good to see what's in the base and if any parts are loose or out of tolerance.?

Checked them visually and physically and can't see problems... waiting on an LCR meter to confirm... thanks!

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