You can click on the wi-fi icon in the menu bar to see which wifi network you are connected to and other networks near you. But if you hold down the option key and then click, you can see other information as well, like the RSSI (signal strength), the more important Transmit Rate, and the channel you are using. Move the cursor to the other networks listed and you can see some of that information for each one. RSSI numbers, by the way, are measured backwards, with around -50 being excellent and -100 poor. But Transmit Rate is a better measurement of the connection.
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