If you have a wireless key fob for a car with a remote keyless system, then you might want to start keeping your keys in a freezer or other Faraday Cage to protect it from high-tech thieves, who can use a $17 power amplifier to break into your vehicle.
Cars with keyless entry systems are capable of searching for a wireless key fob that is within a couple feet of the vehicle, but car thieves can use a $17 "power amplifier" to boost the key searching capabilities, sometimes up to around 100 meters, and pull off a high-tech car break-in. more extra spy credit