In this design, the six squares and 9 pairs of reflectors get an effective gain above 18 dB at channel 24 and 25, with a reasonably gradual drop off on the lower side of channel 24. Now I just have to build this and test it in the real world.
XGH9-ch25.nec

I'm working on an XGH myself, tuned for channel 15 (479 MHz). I'll post the design at my blog: http://kcpolymath.blogspot.com/
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