Some sites, such as AutoExpress, are warning about a method of breaking into vehicles with keyless entry by capturing and relaying the fob's signal.
To quote AutoExpress:
The process criminals use to steal a car via keyless theft – also known as relay theft – is relatively simple. First, they buy a relay amplifier and a relay transmitter; these electronic gizmos can be purchased from the darker corners of the internet.
Next, they identify a house with a nice car parked outside and, by using these gadgets, can detect whether the car features keyless entry and go.
One criminal then stands by the car with his transmitter, while a second waves his amplifier around the perimeter of the house. If the car key is close enough the amplifier will detect its signal, amplify it and send it to the accomplice’s transmitter.
This transmitter then effectively becomes the key, and tricks the car into thinking the real key is nearby, whereupon the thieves are able to open the car, get in and drive away. The whole process can take as little as 60 seconds and can be completed in near silence and as for safety reasons the engine won't just cut out when the key is out of range, there is very little to stop the thieves.
Is keyless theft/relay theft a practical threat for vehicles with fob/keyless entry?