A company from Switzerland found a method that can be used to gain access to a vehicle that uses keyless-entry. They used readily available equipment ranging from $100-$1000 to transmit radio signals from the car owner to the car using 2 Antennas- one within 26 feet of the person holding the key fob and and one within 20 feet of the target vehicle. What happens next is very simple, the key fob generates a low powered signal when the antenna is within range and the antenna transmits the signal to the other antenna allowing a thief to gain access to the vehicle, and if it's a newer car with a start button they can drive off.
Practical application for a thief would be to have multiple parties helping to spot the car, and the owner without being spotted themselves. Something I think could work even better would be to utilize an antenna booster which would greatly increase the distance of the antenna's range to locate key fobs and transmit it to the 2nd antenna near the car. If this would work this means that instead of one thief having to be near the key fob holder and another near the target car, one thief could stand near a target car and use the antenna booster (while standing near the car) to pickup and transmit the correct key fob's radio signal and steal the car. In theory this seems very possible.
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