Keyless entry fobs result in rash of vehicle thefts

In Toronto, Los Angeles, Long Beach, New York, Springfield, and more cities, police have reported a spike in thefts from Toyota and Lexus SUVs, Priuses, and more vehicles, all parked in owners' driveways with no signs of damage. As more people buy cars with these no-push key fobs, what's the solution to stopping this type of break-in? "Use a microwave" or wrap your keys in aluminum foil. The heavy metal cages block the signal. It's another case of convenience becoming a two-edged sword.
If you build a wifi cantennae you don't need one on both ends... one will do. So standing close to the car and aiming a cantennae or yagi around is all it would take.