Gee, guys, this is another of those 'once a year' threads.
The average 3 element beam has a half-power beamwidth
of +/- 35 degrees. How closely do you really need to
know where North is? How much effort is it worth?
Use a compass, and look up the magnetic declination in an
almanac, for pete's sake. Or look on a marine or aeronautical chart.
In critical applications, where you have long-boom VHF/UHF yagis,
and are dynamically pointing at LEO satellites, I could see needing
to know within a few degrees. But even that should be satisfied by
a declination adjustment to magnetic north.
The hootowl discussion was more entertaining!
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