Software Defined Radio allows you to create receivers or even transmitters for any radio signal. You just need a single peripheral connected to your personal computer. HackRF One is such a SDR peripheral, connected through USB. It receives or transmits signals from 1 MHz to 6 GHz. Designed to enable test and development of modern and next generation radio technologies, HackRF One is an open source hardware platform that can also be programmed for stand-alone operation.
If you are interested in the topic of SDR, but feel insecure about it, you should start with the video below (and the following four) by Michael Ossman who is also the creator of HackRF One. His highly educational videos will introduce you to HackRF One software including GNU Radio, and teach you the fundamentals of Digital Signal Processing needed to take full advantage of the power of SDR.
If you are comfortable with the subject, skip this step and start with the second integrated video below.