Wireless Data

I am switching plans from one employer to another and have the opportunity to get a new card. I currently have the Cingular (Globetrotter?)Option GT Max 3.6 with the flip up antenna. It works OK - great actually in DFW 3G areas, but is terribly slow in the outlying areas of west Texas like Brownwood and Big Spring. I was hoping for something with a better antenna might help out in those places? Cingular only offers 4 choices of cards and the 875 is supposed to be their latest and only one compatable for Vista (which i have no immediate plans to use Vista but might on my next laptop upgrade)

Is the 875 a good choice, and any advice about external antennas for it that might help out in the boondocks? I think I can keep my current card and j...
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