Why won't my MacBook Pro connect to my wifi?

I have a MacBook Pro running OS X 10.8.5.  My ISP is BT Vision so have a open reach fibre modem and a BT HomeHub. All my other wifi devices (iPhone 4S, 5S and Ipad 3) connect to my home network and internet first time every time! However, my MacBook is extremely temperamental.
When the laptop does connect to the internet it takes a random combination of restarting and turning the wifi on and off. If the laptop is left to connect on its own it either takes an extended period of time (30mins) or it simply won't connect. I have looked through the wifi settings but can't see any reason why the laptop won't connect. The wifi network is visible all he time.
Any ideas?

I know how to solve this problem had the same issue, its basically because you BTHome hub runs a 5GHz frequency a long with a 2GHz frequency and for some reason your mac tries to connect to that even though they dont have the techologies will allow them to run on that frequency, making you not connect to the internet. To fix this log into your homehub settings onlin by going to http://bthomehub.home/then going to advanced settings, wireless which should be under it and then click on the 5GHz and turn it off or rename  it and click apply. So you can make your laptop connect to the correct frequency. IF you can connect to the internet on your laptop then you can still do the same steps and process on your phone or any device that connects your BThomehub.

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