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RTL-SDR

From The RadioReference Wiki

RTL-SDR USB Dongle

RTL-SDR is an inexpensive (~ $20 USD) software defined radio that uses a DVB-T TV tuner dongle based on the RTL2832U chipset.

RTL-SDR Supported Frequency Ranges

Supported frequency ranges depend on the tuner.

Tuner Frequency Range
Elonics E4000 52 – 2200 MHz (minus 1100 MHz to 1250 MHz)
Rafael Micro R820T 24 – 1766 MHz
Fitipower FC0013 22 – 1100 MHz
Fitipower FC0012 948.6 MHz
FCI FC2580 146 – 308 MHz / 438 – 924 MHz

The Rafael Micro R820T is by far the most popular and widely available tuner in the RTL-SDR dongles..