Tom Donaly wrote:
Slap it on your truck, and tell us at what frequencies it resonates.
Can you get it to resonate at odd multiples of its fundamental frequency?

To be entirely technically correct, it should be pointed
out that we are discussing the first resonance as is
usually used in loaded mobile antennas. Starting from
a low frequency, tune the analyzer until the first
resonance is reached. That is when it is electrically
close to 90 degrees in length.
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73, Cecil http://www.w5dxp.com