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