5 Ghz band and Macbook pro

I use Airport Extreme with dual band but my Macbook pro doesn't connect with 5 Ghz band even if I'm near base Airport. Only one or two times I had a 5 Ghz connection with my mac. How could I set base Airport or Mac to connect always with 5 Ghz. Thank you

You might want to assign a separate name to the 5 GHz network so you can "point" your Mac directly at that band to connect.
Open Macintosh HD > Applications > Utilities > AirPort Utility
Click on the AirPort Extreme icon and then click Edit in the box that appears
Click the Wireless tab at the top of the window
Click the Wireless Options button at the bottom of the window
Enter a check mark next to 5 GHz Network Name and "(5 GHz)" will be added to the name of the 5 GHz network signal so that you can identify which network you want your Mac to connect to
Click Save, then click Update
If your Mac still has trouble connecting to 5 GHz when it is close to the AirPort Extreme, the wireless card in the Mac may be acting up. Normally, you would not need to point the Mac to the 5 GHz signal if it is close to the router as it should connect automatically when in close proximity to the AirPort Extreme.

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