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The connector on the wifi card is a U.FL, you can use a U.fl adapter pigtail or directly connect a U.fl antenna. Those are the two easyist ways.
Linksys routers have disconnecting antennas, not wires. The wires inside are soldered. So you would need the pigtail to solder on with the wire, and then yes, you could use it. I found the pigtails on 4 inch wires for about 3 bucks a while back, but lost the link during a format. I did a wifi antenna mod using a D-Link gaming router antenna. It was connected with the U.FL connector inside, so it was a matter of wire hole, and mount, so it was simple. Click this to see my antenna mod.
Hey would this work? http://www.dealextreme.com/details.dx/sku.9307