Compaq laptop wireless w200 antenna jack howto use

i've got a compaq laptop n800c and bought a proprietary wireless card that fits on the back of the display. in the stock config it works satisfactory. but want more..

during install i noticed what looked to be an antenna jack. after doing a little research on the web i found that it was an mc card connector, so i bought a cheap antenna, with the appropiate connector and was looking forward to increased range. but i was disappointed to find no increase in performance when attached.

after more time researching, all i could find was a short conversation on some forum, where a person said that you had to do some soldering on the pcb. and that was where they left it.

i would be very grateful for any input on the subject at all, anything as to where to look or if anybody has had experience with this card.