wifi spectrum analyzer?

So I have not done too much research on the subject, but I was wondering, what keeps a normal wifi card from being used as a spectrum analyzer? It connects on frequencies and can guage the connection strength. What keeps it from sensing interference and how much interference? What keeps it from just being a matter of creative programming? I'm personally going to get my boss to buy me a wi spy to play with (oh sorry, to analyze my work's network..... once) then it will be mine and disappear. So is there anything that can be written for a traditional wifi card that could analyze interference in the used channels?
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More about wifi spectrum analyzer
  1. You should be able to use Airsnort and programs like kismet to do things similair to that, may not give you want your wanting but its better then 0. im spoiled i get Air Magnet to play with but honestly im not impressed w/it.
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