It takes more effort to post on this forum than it takes to google the model number.The price?
amen.Did you spend 5 minutes of your life and do as suggested above "To check the signal strength download the free app on your MacBook "WiFi Explorer Lite"."
If/when you have done so pls attach a screenshot of the result, it will show the signal strength and specific channel usage in your location. Nobody can give you any guidance without basic facts from your side.