Wifi Analyzer

I'm looking for a Wifi analyzer that detects coverage areas/signal strength, existing SSIDs and radios, scans for the best channel to use, and in general helps with optimal deployment and configuration of access points. I tried some products and see a myriad of of others on the market. What have you guys used or recommend as a good reliable analyzer? Also for me it doesn't matter if it's on a smart device, laptop, or some external unit so long as it's reliable and provides good statistics.
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I use my Android phone and tablet to analyze WiFi.  These are the two I've used and they should suffice your requirements:



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