If you hold down the Option key and click on the WiFi indicator at the top right of your screen in the toolbar, you will get additional information about your current WiFi connection. You’ll find out your signal strength and WiFi channel. You’ll also see your MAC address, which you sometimes need to give out to be allowed to connect to closed WiFi networks.
Related: Detailed Wi-Fi Information, Get More WiFi Information, Lion : iMac does not automatically connect to my WIFI network !, Using Airport Express to provide Ethernet connection from existing WiFi network?, WiFi continually looses its connection.

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