That is if you want to amplify the signal. But if it's an adversary, they need to do a sort-of MITM to take the car's signal, amplify it, and then turn around a

That is if you want to amplify the signal. But if it's an adversary, they need to do a sort-of MITM to take the car's signal, amplify it, and then turn around and take the key's response and forward it to the car.