https://tinkersphere.com/wireless-modules-for-raspberry-pi-and-arduino/1851-sdr-software-defined-radio-receiver-usb-stick-rtl2832-wr820t.html
$22.49 - SDR: Software Defined Radio Receiver USB Stick - RTL2832 w/R820T - Tinkersphere
Receive Radio signals via USB with this SDR (Software Defined Radio) USB Stick with external antenna. Antenna included.
software defined radio