Dell :: Adding External Antenna To Xps M1710 Internal Wireless Card

This is what I am working with:

Computer rig:
Dell XPS M1710 Review (pics, specs)

Wireless card intel specs:
[url]

And I think this is the external antenna I would like to get (would love any suggestions):
5 dBi Magnetic Mount Omni Antenna - Omnidirectional Antennas for 2.4GHz - Antennas - Fleeman, Anderson & Bird, Corp.

The pdf says the wireless card antenna is, "Hirose* U.FL-R-SMT mates with cable connector U.FL-LP-066"

So basically is all I have to do is buy one of these, 4 inches U.FL Pigtail:U.FL to MMCX WiFi 2.4GHz 802.11g - eBay (item 160119011606 end time Apr-09-09 01:58:22 PDT)

Drill a hole in my laptop case and install one of these connected to the first adapter that is connected directly to the card:
MMCX to N-Male, Pigtail 19" 100-Series - CA-MMNMCN19

Now the n-female from the antenna can then connect to the now adapted laptop wireless external antenna?

I am presenting all of this as a question because I think this is what I need to do but I would like to double check with some knowledgeable people first that this can work, is feasible, will bring desired results (increased range) etc.