RTL-SDR is a cheap software defined radio that uses a DVB-T TV tuner dongle based on the RTL2832U chipset and R820T2 tuner.
100KHz-1.7GHz Full Band HF RTL-SDR USB Tuner Receiver/ R820T+8232
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RTL2832u RTL SDR Receiver R820t2 USB RTL-SDR Dongle with 0.5ppm
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Software Defined Radio RTL-SDR USB Receiver Set With Antenna AM
How to calibrate your SDR aka what's my frequency
Radio Receiver 100KHz-1.7GHz Full Band UV HF RTL-SDR USB Tuner
Buy NooElec NESDR Mini 2+0.5PPM TCXO USB RTL-SDR Receiver (RTL2832
RTL SDR USB DVB-T RTLRTL2832U+R820T, Model Name/Number: RTL2832U+
SDR receiver usb c instead of usb plug : r/RTLSDR
New RTL-SDR Drivers and SDR-Console ExtIO Available: Bias Tee
RTL-SDR: Seven Years Later
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RTL-SDR Installation Instructions