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Sep 9, 2016 9:46 PM in response to Emilyc2014by leroydouglas,hold the option key and click the wifi icon in the upper right menu bar>Open Wireless diagnostic
See if this returns any useful information about your Network
5Ghz is faster but travels a shorter distance. 2.4Ghz is slower but has a further reach through walls etc.
You can trouble shoot http://osxdaily.com/2015/10/16/fix-wi-fi-problems-mac-os-x-el-capitan/