Decided to take my IBM Thinkpad T41 apart to upgrade a few things.
Noticed the WIFI card has TWO antenna jacks, internal and EXTERNAL!
Followed the 'external' antenna wire to find it ending up by the USB
ports. Upon close examination noticed just left of the USB ports is a
small vertical rectangular opening with what APPEARS to be, an antenna
symbol. Hmmm.

I have a radio hobby and have seen a lot of antenna jacks but they are
all HF, VHF, UHF types. Being the WLAN uses frequencies above these (it
transmits at 2.4GHz) that must be the reason for the different jack.
Thing is, where does one find an external antenna with a rectangular
plug? I have a couple of WIFI antennas for 2.4GHz but they do not have
rectangular antenna plugs, they're coaxial type.

So how does one use an external antenna with one of these rectangular
jacks?

Thanks