About WiFi's Frequency

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Network StandardFrequency RangeBandwidthMIMO StreamsIndoor RangeOutdoor Range
802.11A5GHz20MHz1115ft390ft
802.11B2.4GHz20MHz1125ft460ft
802.11G2.4GHz20MHz1125ft460ft
802.11N2.4GHz20MHz/40MHz4230ft820ft


Now, I would like expect a question: How to find which WiFi frequencies are being used the most near by?
You should use commnad: sudo iwlist wlan0 scan | grep Frequency | sort | uniq -c | sort -n
And you will get a result like this:

2 Frequency:2.412 GHz (Channel 1)
2 Frequency:2.417 GHz (Channel 2)
2 Frequency:2.462 GHz (Channel 11)
10 Frequency:2.437 GHz (Channel 6)

As an extra bit of useful data, you can see what frequencies your WiFi card supports using this command: iwlist wlan0 channel

Have a good release, guys!

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