"This repository contains hardware designs and software for HackRF, a low cost, open source Software Defined Radio platform."

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https://greatscottgadgets.com/hackrf/one/

"HackRF One from Great Scott Gadgets is a Software Defined Radio peripheral capable of transmission or reception of radio 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 be used as a USB peripheral or programmed for stand-alone operation.

    1 MHz to 6 GHz operating frequency
    half-duplex transceiver
    up to 20 million samples per second
    8-bit quadrature samples (8-bit I and 8-bit Q)
    compatible with GNU Radio, SDR#, and more
    software-configurable RX and TX gain and baseband filter
    software-controlled antenna port power (50 mA at 3.3 V)
    SMA female antenna connector
    SMA female clock input and output for synchronization
    convenient buttons for programming
    internal pin headers for expansion
    Hi-Speed USB 2.0
    USB-powered
    open source hardware

HackRF One has an injection molded plastic enclosure and ships with a micro USB cable. An antenna is not included. ANT500 is recommended as a starter antenna for HackRF One.

HackRF One is test equipment for RF systems. It has not been tested for compliance with regulations governing transmission of radio signals. You are responsible for using your HackRF One legally."