61% of US households have wifi–How many are open networks?

I was reading flip board app this morning and ran across this article from techcrunch – http://techcrunch.com/2012/04/05/study-61-of-u-s-households-now-have-wifi/ A study shows that 61% of US households have wifi.   The US is lower on the list 8th behind the UK and places like Germany.  I thought that 61% is a pretty good number.   From a security perspective I wonder what percentage of those …

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