Is there a totally free wifi app to show available in detail?

I'm looking for a iphone app better than the wifi standard builtin to the iphone. Is there a free app that has a diagram or map that can give distance or direction and level of wifi signal?
I tried to isolate a free wifi signal at a friends house but walking down the road but it kept dropping in a out. there are several open router signals in his neighborhood, and he cannot afford the internet.
I can give him an old vista pc and install a pci wifi card.
He and she are 79 and 80 years young and want to know the truth in politics without hearing the bull on the nightly local liberal news and comments on how to vote.

Try inSSIDer

I need an app for the iphone 4

Itunes says they have an app like insidder but I don't trust if it's really free or not.

Does anyone else have the Sweetspots app on there iphone, and was it or is it free?