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a) use a directional antenna for the jamming transmitter. Everyone except the car can receive the fob signal just fine

b) use a directional antenna pointed at the fob. You jam everyone but RSSI for the fob signal received through the antenna is still acceptable

c) jamming signal triggered by fob transmission, possible to jam specific packet bytes, like the CRC (recoverable later)

d) jamming signal uses a period that is a little shorter than packet length, repeated packets can be recovered by combining their intact parts

etc..