<div id="Electronic_Tools-SDR" title="Software Defined Radio’s" class="items">
[https://www.rtl-sdr.com/about-rtl-sdr/ RTL-SDR] - Very low cost (~$30) receiver operating from about 52MHz to 2200MHz.
[https://www.sdrplay.com/rsp1a/ SDRPlay RSP1a] - Medium cost (~$160) receiver operating from 100 Khz to 2000 MHZ. Device includes a lot of selectable filters (to cancel broadcast FM, WiFi interference, PC interference etc).
[https://greatscottgadgets.com/hackrf/one/ HackRF One] - Capable of transmission or reception of radio signals from 1 MHz to 6 GHz. Open source hardware platform that can be used as a USB peripheral or programmed for stand-alone operation. Cost ~$340