Sounds like one of the driven element lengths is compromised.
Perhaps one of the element tips isn't making good electrical
connection to the rest of the element?
My best guess.
Quoting Larry Smith <firstname.lastname@example.org>:
> I have converted a KLM KT34XA to a KT36XA and have run into a problem with
> SWR on 20 meters. The SWR curves are almost flat on 15 and 10 but the 20
> meter curves are wacky. The resonance is no where around 14 MHz but begins
> to improve around 16 MHz.
> Element/capacitor lengths have been rechecked several times and appear to be
> Any thoughts or suggestions.
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