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I want to work out whether or not there more spectrum needs to be allocated in the 2.4GHz band, or any other licence-exempt band.
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Sure they could allocate more channels to the band, problem is you'd still have the same problem. Manufacturer's would still put their gear on channel 6, clueless lusers would still open their box, plug it in and say "hey it works!" and then go about surfing for pr0n.
Until people do what Thorn said, read the book and set things up properly, there's always going to be congestion.
What I do think should happen is that if you're going to be running wireless inside a business or any non-residential area, you should have certain channels assigned that you may use that residential equipment cannot use. The band could be expanded in such a way so that hospitals and such would have clear channels to use and not have to fight with consumer grade gear for space.