I have had 6 FOB cars in the past 20 years. ALL require that the FOB RF signal be CLOSE to start and run. The Lexus and Lincoln required the KEY to be in the Ignition with the constant FOB RF sending the signal to START and RUN the car. My other FOB's that have NO KEY, require that the FOB be within a few feet of the Dash Push Button and you must push the Brake Pedal while pushing the Start Button. Just unlocking the Auto with a stolen or hacked RF signal will not get the Auto started. Doug
PS, I leave tinfoil draped over all the headrests and have never had a problem. Make sure you leave the Shiny side UP:B