negative gain antenna

hello all
i simulated this antenna in HFSS for circular polarization but the gain of antenna is negative? i intend ask a question whats the negative gain? gain is a positive quality

Could there be standing waves in the line?

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your gain plots are in dB (-4 to -1 dB), these correspond to gain <1; not negative.

hello rntsay
thanks for reply
just a question
How we can improve the bandwidth of axial ratio(for circular polarization)
is it possible we reach 1GHz bandwith CP for this antenna?

sorry but that's well outside what I know. I don't think it's an easy problem
even for experts.