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I know a helical will get a gain boost of 3 Db if it's receiving a circular polarized signal (if both match direction of rotation wise).
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Actually the boost is 3 dB only if both ends have an "axial ratio" (the ratio of horizontal to vertical signals) of 1 equal horizontal and vertical signals.
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And a helical is equally sensitive to vertical and horizontal polarized signals (and all angles in between)
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again the axial ratio affects how much.
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But will a helical reject multipath or bounced or out of phase signals?
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odd numbered reflections are blocked (attenuated) even numbered are not effected.
So single bounces are blocked and twice bounced are received.
edit: Found this recently
http://www.attplus.eu/hamradio/proje...cle/cppl_b.pdf