Finding white space in the spectrum can be done by looking at power across the bins you are monitoring. I have done White space research with the USRP2 and the WBX, and they worked out great for me. So you're on the right track!
Take a look at this work, Section 3.1: http://static.usenix.org/event/nsdi10/tech/full_papers/yang.pdf They have a basic technique for detecting white space. Their paper was not about the TV bands, but the technique should work elsewhere. Best of luck, and welcome! - George
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