Most likely, but it will require opening the device and soldering in a suitable cable. If you are confident with soldering then go for it.
Open up the unit and see where the existing antenna is wired to. It will probably have a small pigtail soldered to the main PCB. Desolder this and replace it with a suitable pigtail lead, and you should be good to go.
If you want to give it a try but aren't sure where to look, you could post some pictures of the insides so members could explain possible ways to go about it.
Linksys WUSB11 802.11b Wireless Adapter MOD? 
Linear Mode
