Why my MB Air decreases the wifi signal

My 2012 13 "core i5 MacBook Air running different operating systems will remove the wifi signal and it is getting worse. someone at - it a reason why?

How your MacBook Air running different OS version? However, the Wi - Fi signal fell to each version?

This always was a problem or just started to happen? Up to now, what did you do to try to solve?

Tags: Wireless

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