Thieves amplify a vehicle's radio signal to access and copy the key fob signal to steal a vehicle. Here's how to block the signal.

Your newer model car with its wireless key allows you to open the door and start the engine without ever taking the key out of your pocket.

Car key fobs operate using two pieces of radio-based technology: radio waves and a radio frequency identification system, or RFID. A wireless key fob has its own unique RFID signal paired to your car.