I've used this one before, and it does a good job: https://play.google.com/store/apps/details?id=com.farproc.wifi.analyzer&hl=en_US https://play.google.com/stor

I've used this one before, and it does a good job: https://play.google.com/store/apps/details?id=com.farproc.wifi.analyzer&hl=en_US https://play.google.com/store/apps/details?id=com.farproc.wi... It's great for finding unused channels for your AP.