Jamming GPS Signals Is Illegal, Dangerous, Cheap, and Easy
I ordered it on eBay. When the four-ounce envelope arrived from New York three days later, it looked innocuous enough. It contained a finger-sized black plastic box, a small black antenna to screw onto that box, and two glass fuses. It was designed to fit into a car's 12-volt electrical socket (that thing that used to hold a cigarette lighter).