I was trying to use the GPS Expansion USB board with onboard antenna. And it could not find any satellites at all. So I took a passive patch antenna, and connected it instead. And The module started working. It fetched data from 6 satellites with decent 30-35 dB-Hz.
And now I am trying to find schematics of this module to identify the part number of the built-in antenna (and maybe replace it). But it seems it's not on the internet. And antenna itself does not have any marking on top.
Maybe someone can tell what antenna is used in this module?