HackRF One

HackRF One from Great Scott Gadgets is a Software Defined Radio peripheral capable of transmission or reception of radio signals from 10 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.

10 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...

https://greatscottgadgets.com/hackrf/