If you're the kind of person that doesn't listen to AM/FM you can buy a connecter and wire up the car antenna to the system. Theres a 50 50 chance that war driving is legal and illegal. If you plan to just use some one's wireless connection to surf the net "legal stuff" it's alright. But if you access other computers on that lan or do some illegal downloading then it's illegal.
To live is to let die