If that’s your purpose, just attach an airtag to the car keys keychain. However, you can definitely use an SDR to capture the signal, and to send it you need th

If that’s your purpose, just attach an airtag to the car keys keychain. However, you can definitely use an SDR to capture the signal, and to send it you need the SDR to be able to transmit, rtl-sdr won’t work.