I’ve played around with Agere WiFi cards in laptops. These are not PCI type cards, they are cards like ram cards that fit into a slot under the covers underneath the unit.
There is a tiny connector port on top of the card for the antenna - no actual voltage runs through the antenna.
All you need do is connect just about any kind of wire to it. As long as it is 12-16 inches long, it should give you plenty of signal.
So find your antenna port, get a short piece of spare wire, strip the end and plug it in there. You’ll get a signal.
FYI: I believe you're referencing the miniPCI form factor.