

To keep things simple, the RSSI is the signal strength of an access point.

Although the Scan may tell you which channels are least used in your area, the dirty little secret is that only 3 channels have the best connectivity due to something called "Channel Overlap". The 2.4GHz Wi-Fi range is a bit more complicated. Wait for your Airport Base Station to reboot and you're all set! The 2.4 GHz range.
