Macbook Air A1466 - WiFi channel 13 We are 5 tenants in a big house in the Netherlands and apparently channel 13 is the only one not too crowded to offer us a decent connection. Setting the router on any other channel makes the internet almost unusable for everybody. Problem is that the  cannot detect the WiFi connection whenever it is set on channel 13. 

Is there anyway to get a Macbook Air to detect channel 13 on our Wifi router? 

Thank you.
First open you About this Mac - more Info - System Information

then look under the 

WiFi

Here is what it looks in my place in Spain.



The Ch 1..13 are on 2.4 GHz and the 36...140 are on 5GHz, if your router supports it switch to 5 GHz and you will be lonely there (almost)

If not possible to use 5GHz - (router limitation)

Take Note of 

Locale and Country Code (those need to changed to see the Ch 13)

Next check your router settings for Location/Country Code.

The country code of your router is whichever one it was legally purchased for use in. See if it can be changed.