Variations up to 20 degrees is certainly a concern for determining
how best to set antenna directivity. Just wondering, how wrong could
a person be it the boom of an antenna was pointing right at the
North Star (Polaris), regardless of QTH in Maine or Pacific NW?
de Joe, AA4NN
>Stu Greene <wa2moe@doitnow.com> writes:
>
> Lines of equal variation are "isogonic lines", and probably can be
> found on the web. In the United States, the line of zero variation runs
> approximately from western Lake Superior southeasterly to just off
> the Eastern Florida coast. Places in the US east of that line have
west
> variation and in Northeast Maine as much as 20 degrees. Places to
> the west of the zero line have easterly variation and exceed 20 degrees
> in the Pacific Northwest.
>
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