Yes. You can do this directly from OS X Mountain Lion or you can use an App like WiFi Explorer.
To do so directly from OS X, you would use the built-in OS X Wireless Diagnostics, as follows:
- Option-click on the AirPort icon on the OS X menu bar.
- Select "Open Wireless Diagnostics..."
- Enter your Mac's Administrator credentials in the next window.
- On the Wireless Diagnostics window DO NOT click on "Continue." Instead, go to the diagnostic's menu bar, and then, select Window > Utilities
- Start the test with the laptop near the wireless router. Note the values for RSSI and Noise. They should both be negative and measured in dBm.
- Now take the laptop to the other locations that you want to access the Internet in your home. Different rooms, different floors, etc. Again, note these same two values at each of these locations.
- When you have finished collecting the data, you will want to enter them into the following formula for Signal-to-Noise Ratio (SNR). SNR = RSSI - Noise. For example, if your get the following readings: RSSI = -61 dBm and Noise = -84 dBm, SNR = (-61) - (-84) = 23 db
To get decent wireless bandwidth performance at a location you will want the SNR value to be 35+ dB. You should take these measurements with just the 6th gen Extreme operating and again with both base stations running.
