A vehicle security apparatus for preventing unauthorized use of a vehicle includes an antenna communicating with at least one remote device. Detection circuitry detects damage to and/or removal of the antenna. An operator authentication device determines whether a operator has authorization to operate the vehicle. A shutdown device at least partially disables the vehicle if the detection circuitry detects the damage to and/or removal of the antenna, and if the operator authentication device determines that the operator does not have authorization to operate the vehicle.