Check The Strength of Wireless Connection Using Mac

When you want to check AirPort Status in your Mac’s menu bar to see what wireless networks are available. But when in a particularly busy place full of wireless hotspots, you can view the list of networks sorted by signal strength.

You can do this with Tiger. First, you need the AirPort Status menu in your menu bar. Go to the Network preference pane. In the Show pop-up menu, select AirPort. Click on the AirPort tab; then select the Show AirPort Status In Menu Bar option at the bottom. An icon resembling a striped pie slice shows up in the menu bar.

When you want to see all the wireless networks available to you sorted by signal strength, from strongest to weakest, simply hold down the option key and click on the AirPort icon on the menu bar.