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Several different commercially made yagi style antennas use "x" style director elements.
They would make perfect sense on antennas that use a bowtie style driven element. On the 91XG, which has a modified folded dipole stlyle driven element with the X directors, I found they seem to only smooth out the gain curve on channels above 60.

Other types of directors in use are diamond shaped ones and circular ones. I havent investigated their effects. Some shapes look like they were chosen just for looks, heh.
 
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