The AA's president has shown that he retains a keyless fob inside a metal box in his microwave, since crooks stole his wife's £50,000 Lexus car.
Edmund King tried his best to stop thieves blocking the key's signal and taking his car, by storing it in a Faraday pouch, which is a leather bag with a wire mesh lining, inside a red metal box.
He then safely stored it in a microwave, at the back of the house, far from the road, reports The Telegraph.
But whilst the metal casings should stop the fob's emittance from being intercepted by car thieves, Mr King also splurged on a £110 full steering wheel lock, to keep the vehicle in place when it is parked on his driveway at his Hertfordshire home.
He has also considered a retractable security post at the entrance to his driveway.
Mr King thought about installing gates to stop anyone who outsmarts the security measures from driving away with the car.
Such measures might seem over the top, but the past year has seen a 22 per cent rise in car thefts to nearly 110,000 - and Mr King's family were outraged after a criminal gang stole his wife Deidre's £50,000 Lexus.
There has been increasing evidence of crime gangs taking luxury cars so they can use tech kits bought off the internet to "relay" signals from unprotected keys inside people's homes to unlock vehicles.
A thief with an amplifier can stand by the property to pick up the fob's signal, which is then relayed to another gang member with a transmitter by the car, ensuring the vehicle's sensors think the key is nearby and the doors can be safely opened.
As one of Britain's leading motoring experts, Mr King said was worried that the gang who took his wife's car was even more sophisticated, because her keys had been slotted into a Faraday pouch far from the front door.
He thinks the criminals scoured the house in advance, looked for movements, and then intercepted the keyless fob signal when his wife arrived at 6pm.
Mr King said: “We think they came back at 11.45pm and used their computer device to unlock the car and remove it with no smashing into the car or anything.
"We didn’t notice it until the next morning, by which time it was probably in a container with its plates changed on its way out of the country.”
It comes as the AA says motorists should safeguard their keys with measures such as Faraday pouches, following a poll of 4000 owners of cars with keyless entry.
It found that more than half - 51 per cent - admitted they did not protect their fobs in any way, leaving them exposed to relay theft.
