When trying to use 5GHz connection on the Asus RT-AC87U, the macbook doesn't detect the wireless signal unless it's on channels between 36-48. As soon as I select higher/faster channels such as 149-161, I cannot see the 5GHz connection as an option. When I set it to Auto, the router selects one of those higher channels which means I can't normally connect to either, and manually setting it to any channel between 36-48 renders the connection really slow. The strange thing is that my friend's macbook pro (mid 2013) detects the connection with no problem. Anyone knows why this is happening ? I had a TP-Link router before and connecting to a 5GHz connection wasn't a problem.