Nobody is advocating carrying the fobs in a "spaghetti strainer" evidently you overlooked some details. The small sifter is used at home and it was small, convenient and most importantly immediately available and works 100% without fail adjacent to the car. For travels there are several convenient alternatives available on Amazon, etc., that are specifically designed to block RF, GPS, etc. These alternatives are pouches that are flat when empty.
Clearly, not everyone feels there is a threat. Good luck to you.
how can you know your homemade cage works, or the RFID/ RF/ LF/ UHF/ blocker type devices on amazon/ as seen on tv ads/ etc / work without testing with one of these amplifiers?
wonder where they got the idea about putting the fob in the freezer? ahemsnowdenahem
"We note that the main reason why relay attacks are possible on PKES systems is that, to open and start the car, instead of verifying that the correct key is in its physical proximity, the car verifies if it can communicate with the correct key, assuming that the ability to communicate implies proximity"
the amp can be built for 17 bucks from what i read and speed betweeen points is critical in the attack..
Store the key fob in a "Faraday cage"
Experiment with removing the battery from the fob.
Some auto systems have a "dead battery fallback" provision which relies only upon passive RFID proximity.
Longer term: RF Distance Bounding
Measure the Challenge/Response round trip time.
300,000,000 meters / second (299,792,458)
300 m/uS or 0.3m/ns or 3.336 ns/meter
1 meter round trip: 6.67ns
Transponder *must* have a response time variability that's small in relation.