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ASUS RT-AC68U 2.4ghz wifi signal sucks, but 5ghz wifi is fine

When using a dual band wifi router, anyone connecting to the 2.4ghz network would only work about 5 feet from the device and die off / drop signal as soon as you moved away from it.

This is for an ASUS RT-AC68U router.

Go into the settings for the SSID and choose channel bandwidth 20mhz instead of 20/40