If you’re into Radio Hacking, HackRF One is your go-to tool.
Designed and created by Great Scott Gadgets, HackRF One is a Software Defined Radio peripheral capable of transmission or reception of radio signals from 1 MHz to 6 GHz.
You can use HackRF for sniffing radio communications, transmitting your own signals or even replaying the signals that you have captured.
We have personally used HackRF in a number of our pentesting engagements for radio exploitation, and have had great results.
Video: Unlocking Cars with HackRF
(Video by Nosferatu Hacking)