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		 I am no engineer but I don't think overlapping areas of coverage will affect one another.  
Where I live I can search for wi-fi signals and other than my own router, I pick up 1 business and 3 of my neighbors. 
(if it matters to the discussion or if you're curious, one of them is unlocked, has been told, knows, and doesn't care) 
I game. I watch movies. I surf the web on 3 different computers. I ipad constantly. I watch live TV. I stream music / radio. Often several of these things at the same time. 
I imagine all my neighbors are doing the same... No problems. 
		
		
		
		
		
		
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