1

In other words, if I wanted to create a receiver that would detect a nearby fob, what would I need to listen for? Is it within the Bluetooth range of 2.402 GHz to 2.480 GHz range?

2

Automotive keyless entry systems typically operate at either 315MHz or 433MHz. If you use an RTL-SDR you can pickup the signals. There are also aftermarket antennas specifically tuned to pickup these signals. Depending on the transmitter, you may also be able to get an antenna+decoder pair that will decode/decrypt the (probably) encrypted signal.

Despite these systems typically being encrypted, they very well may be vulnerable to practical attacks. Theese systems are generally designed to hinder sniffing and/or forging a valid message (given the proper hardware), but many implementations are flawed. KeeLoq is popular a popular algorithm, but it's vulnerable to replay attacks as well as being weak enough to be reasonably brute-forced.

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