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"would someone really sit in a car across the street for an hour trying to hack your signal just for a connection?"

It's called "wardriving". They might not necessarily just sit across the street - most likely they'll build a better antenna to go somewhere further away from the house where they can't be seen.

And also, you might wanna re-read the article. It says it might take an hour to crack the password - BUT in Mark's case it took less than a minute.

It might surprise you that someone would do this, but just look at what's going through your network! Not only do you have your credit card info going through there when you buy stuff online, but you might also have banking and billing info, and if you have a file server in your home (which Mark says he does, and now I do too) you might have Quicken files on there, maybe your SS#, and all kinds of other stuff you don't want outsiders to see/know.