The answer is there's no simple answer. From the perspective of the
rotator, you'd want to point the antenna in a direction that results
in minimum rotating moment. Both the boom and the elements of a yagi
antenna have wind drag, and therefore both contribute to rotational
moment. If the boom is asymmetrically mounted (liek a KT-34XA), it can
have substantial moment of it's own. To determine the direction
that gives you minimum moment, you need to calculate the drag as a function
of angle for each of the elements and the boom, and add u all the
contributions. Such calculations are done in the W6QHS book I keep
plugging. Bottom line is it's different for each different antenna.
-Tony, K1KP, fisher@hp-and2.an.hp.com
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