RTL-SDR stick

An RTL-SDR key is an economical, versatile software-defined radio receiver using a USB key based on R820T chips. Initially designed for reception of digital terrestrial television (DVB-T), these keys have become popular in the field of software-defined radio due to its ability to function as a broadband radio receiver.

An SDR key can listen to and decode a wide range of radio signals, from FM radio stations to amateur radio transmissions, aeronautical band signals, marine signals and much more.

With the right software, it's even possible to decode digital signals such as ADS-B data transmissions from aircraft or satellite weather signals.