RTL-SDR is a cheap software defined radio that uses a DVB-T TV tuner dongle based on the RTL2832U chipset and R820T2 tuner.
RTL-SDR Blog R820T2 RTL2832U 1PPM TCXO SMA Software Defined Radio
RTL SDR USB 2.0 Software FM Radio DVB-T RTL2832U + FC0012 SDR
R820T2 RTL2832U TCXO SMA Software Defined Radio USB Dongle For RTL
100KHz-1.7GHz UV HF RTL-SDR USB Tuner Receiver/ R820T+8232 + case
RTL-SDR V3 4.5V 8-Bit Software Defined USB Radio Receiver
RTL-SDR dongle prototype with the relevant integrated components
100KHz-1.7GHz Full Band HF RTL-SDR USB Tuner Receiver/ R820T+8232
FAGINEY UV Receiver,RTL SDR USB Receiver,RTL SDR USB Palestine
SDR RTL2832U and R820T2 USB DVB-T Receiver Tuner FM+DAB Adapter
Excellway Ham Radio Receiver 100khz-1.7ghz Full Band Uv Rtl-sdr
RTL2832u RTL SDR Receiver R820t2 USB RTL-SDR Dongle with 0.5ppm