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BTW - not to omit the fact that 1/4w vertical with ground planes set at a ~45 degree angle brings it back to ~50 ohms.

:D


But this post is about a mobile install; there are lots of things that can influence its impedance if the length is resonant but the surroundings of the install affects the capacative or inductive reactance - or both.  No doubt that it is the install that needs to be dealt with.