Couple of days ago, BBC made available a footage of a relay attack. It shows two men stealing a luxury car in front of the owner's house.
The relay attack devices...
Since ETH researchers demonstrated that cars can be stolen using relay attack in 2011, now we see that devices can cost as low as a few tens of dollars.
https://www.wired.com/2017/04/just-pair-11-radio-gadgets-can-steal-car/...