The GPS Stix Daughter board for the Gumstix comes set up for passive antennas only. In order to get it to work with a passive antenna you need to make a small (perhaps a little too small) modification.
Step 1: Cut the Trace From the Antenna Plug to Pin 19
Take a sharp exacto knife or razor blade and cut througth the copper trace between teh antenna mount and pin 19. BE CAREFUL there is another trace that goes to pin 17 which should not be cut. Use a multimeter to test continuity between the antenna post and the pin. There should be no continuity if you did it correctly.