JIMMIE wrote:
This time I was thinking of using
a pair of crossed dipoles and wanted to know if it would be best to
configure them as a circular polarized antenna feeding them 90 degrees
out of phase or as a turnstile antenna with both elements fed in-phase.

A turnstile antenna has both elements fed 90 degrees
out of phase.
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73, Cecil http://www.w5dxp.com