If you want to save a few bucks on hardware, you can share your EV-DO internet connection through a laptop (have it create the WiFi network for other devices to connect to). I've done it several times with my PowerBook when more than one computer needed online and EV-DO was the only connection available.
MikeT, the way the US legal system works the burden of proof is on the accuser. It's up to me to prove that it was you. If anyone within a 250ft radius of an area could have done something and you have no more information, you simply can't go after whoever owns the property at the center of the circle.