I've found the need to switch wireless channels on my WiFi network regularly to maintain QoS. Fortunately, in Europe we have as many as 13 channels to choose from, whereas the US has only 11. The Intel Centrino chipset is also built using FCC-approved wireless which means only 11 channels.
This limitation also means that the number of channels available for public hotspots in Europe is effectively 11, to cope with the greatest possible number of users (e.g. American tourists won't be able to use channel 13).
Installing new objects in your home may increase multipath effects (basically radio waves bouncing on and off objects enhancing or diminishing the received signal) and may create the need to switch channels. Also new wireless networks in your area may require you to switch channels.
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