i don't know 100% sure which pcmcia senao i had workin on ce 2.0
(nec 750c
), it was 1 year ago. but i think it was the same as yours with the external antenna. i needed to use the belkin driver and not the other one - actually both worked on the 750c but belkin seemed more stable.
(on an mc16 with a cf senao the belkin was the worse one
)
in any case you can just insert the second card, and give it the driver name. that should work. can't remember now if the first card will still work afterwards - but probably it will.