Sure you can.
However if it is on the same subnet Windows Client OS would know how to use both.
I do not know what is the core of your request, but let me make a General statement that has nothing to do with you, and Not directed toward you.
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It is a common thinking these Days that people think ?Oh Goodie, Goodie?, I can use my Internet connection and put a second Wireless Card and tap to my unsecured neighbor?s connetion and get more bandwidth.
Well besides being up right theft, it does Not work this way.
Why? read this page,
http://www.ezlan.net/loadbalance.html
:sun: