Little you may already know, your 802.11g/n wireless device is usually operating on 2.4 GHz frequency. By selecting different channel your wireless network will have a distinct frequency different by 5 MHz. For example, by default, 2.4 GHz won’t operating at exact 2400 MHz frequency, rather the first channel on this category is operating at 2412 MHz, if you keep adding 5 MHz bandwidth per channel, channel 6 will then operating at the frequency of 2437 MHz. However, that being said, your router won’t just operating on this exact frequency, it usually will cover a range of 25 MHz per channel, which means if you want to complete avoid the other channel you need to select at least 5 channels apart. (5×5 = 25 MHz) And there is only 1-11 channels available for average consumers. (note: with the latest 802.11n it will use as much as 40 MHz per channel.)
By selecting a different channel will definitely help to improve any interference you might experienced before. However, that said, you need to also keep in mind your other wireless device at home. Things like your wireless home phone (if its targeted at 2.4 GHz frequency), Microwave oven (at a frequency near 2.45 GHz) usually will also interfere with your Wi-Fi signal, also keep in mind Bluetooth device is also using 2.4 GHz frequency.
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