So you go out and buy the latest and greatest wireless gadget. How often do you think about what other wireless devices might be using the RF Spectrum right next to your device? In between all of the frequencies used by TV stations to broadcast their signals, are smaller, sometimes un-used spaces that are called "White Spaces." In actuality, much of this "White Space" is already in use by television stations running wireless microphones, which they are allowed to do under FCC rules. This space is also used by most bands, churches, towns, convention centers, pretty much anywhere you see someone using a wireless microphone, chances are great that they are using frequencies that they are not licensed for, in these "white spaces." There has been a lot of press recently on the FCC's tests of new prototype wireless devices that might operate within these "white spaces." For these devices to work, and be approved, they need to be able to adapt to their surroundings. If there is a TV station broadcasting on a frequency, these new devices need to recognize that TV signal, and not use that frequency. If another device (like a wireless mic) is turned on, these new devices are supposed to be able to detect that, and change to another frequency to prevent any interference. These test devices have had some serious trouble during these tests in both of these areas. Tests were done at a Buffalo Bills Football game, and at a Broadway play in NYC. Even with these poor test results, the FCC is pushing even harder for the approval of these devices... which haven't been shown to work.
As a broadcaster, the last thing I want is unlicensed wireless devices causing interference to someone's television set, or a wireless microphone that I have a license for. I also understand the need for spectrum to be allotted for these devices, but it has to be proven to work. You can read the entire FCC report here. The executive summary which paints a "nicer" but perhaps inaccurate picture of the actual tests can be read here. If the first two FCC documents didn't put you right to sleep, here is another
link that summarizes it quite nicely.