I can understand the requirement for a dual band
antenna (2.4GHz and 5.8GHz) which is available widely,
but you will probably find it verry difficult to
find an antenna that can also operate in the 1.8GHz.
If I were you, I would just go for the dual
band knowing that I'm sacrificing antenna gain (attenuation,loss)
with the GPS signal and accommodate for that with
a good GPS-LNA.
best of luck.