WWAN mini-pci card question

[Pasho]

Finally I would like to upgrade my x61 tablet to enable built in 3g support. What I don't get is do I really need antenna kit? As I understand there could be 3 or 5 antenna cables. My product id is 7767-96U. I checked the inside of my device and found three. Two cables attached to wifi card, the third one is free. Is it gonna work if I install appropriate 3g card or I should get and install antenna kit too?

[Peak2Peak]

Although the following postings are for the X61s, there may be (?) some useful info within: No WWAN Antenna in my X61s, how do i get one?, HSDPA x61s Part number? and Recomended 3G card