I recently purchased a USB WiFi antenna, once I finally got the drivers installed on my MAC, I was annoyed to find that the network I was trying to connect to was missing from the list of discovered networks. I new this wasn’t because the network was hidden, as I could discover it fine with the laptops internal adapter…

Some research uncovered that my problem most likely lay in the fact there where two spectrum bands.

I couldn’t find an easy way to find out what channel the router was broadcasting on. I eventually found the following methods:

Method 1: using the option key

  1. First, hold down the Option key.
  2. Next, Click on Wireless icon (Airport icon) and you will see information as follows:

Method 2: using system information

Click on Spotlight and type “system information“. OR press cmd+space-bar and then type “system information“. Finally, choose Network and select Wi-Fi. The WI-FI connection information will be displayed on the right.

Method 4: Command line utility

List details of the current network:
/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -I

List available wifi networks from the Mac OSX terminal command line:

/System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/airport scan

Method 5: KisMAC

Connection speed:

Open “network utility” and select the Info tab and choose Wi-fi (en0 or en1) on the drop-down options.

References:
http://www.smallnetbuilder.com/wireless/wireless-features/31694-why-80211ac-will-kill-the-5-ghz-wi-fi-band
http://en.wikipedia.org/wiki/List_of_WLAN_channels
http://www.macworld.com/article/1140685/wifi_spectrumbands.html
http://www.vpj.hu/wp-content/uploads/2014/03/H%C3%ADrk%C3%B6zl%C3%A9stechnika_3_es_4_ea.pdf
http://www.cyberciti.biz/faq/how-to-see-your-current-wi-fi-connection-speed-in-mac-os-x/
http://blog.mattcrampton.com/post/64144666914/managing-wifi-connections-using-the-mac-osx-terminal

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