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I have a MBA 13" mid 12, OS X 10.7.5. It often completely ignores my Wi-Fi network, not showing it in the list of available networks (my Linux boxes and Android devices are connecting perfectly).

I tried to remove my network from the list of known networks, rebooted my router and notebook many times, tried to change encryption standards (now it uses 802.11b/g, WPA/WPA2, TKIP), but network still was not visible.

My router is TP-Link TL-WR340GD.

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After long experimenting I've changed my Wi-Fi channel settings on the router from "Automatic" to an average value (8, in the range 1 - 13).

Now the network is well visible.

Ed. Here: is shown how to check what channels are supported by Apple (Broadcom actually) hardware.

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Try setting the router mode to 11g mode only .

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