The RTL-SDR is an extremely cheap software defined radio which is based on DVB-T TV (Digital HD TV) USB receiver dongles that have the RTL2832U chip in them.
Listening to VHF amateur radio.
Decoding ham radio APRS packets.
Watching analogue broadcast TV.
Sniffing GSM signals.
Using rtl-sdr on your Android device as a portable radio scanner.
Receiving GPS signals and decoding them.
Using rtl-sdr as a spectrum analyzer.
Receiving NOAA weather satellite images.
Listening to satellites and the ISS.
Listening to unencrypted military communications.
Monitoring meteor scatter.
Listening to FM radio, and decoding RDS information.
Listening to DAB broadcast radio.
Use rtl-sdr as a panadapter for your traditional hardware radio.
Decoding taxi mobile data terminal signals.
Use rtl-sdr as a true random number generator.
Listening to amateur radio hams on SSB with LSB/USB modulation.
Decoding digital amateur radio ham communications such as CW/PSK/RTTY/SSTV.
Receiving HF weather fax.
Receiving digital radio shortwave radio (DRM).
Listening to international shortwave radio.
Looking for RADAR signals like over the horizon (OTH) radar, and HAARP signals.
This is a DIY kit, hasn't been assembled yet.
Shell Material: aluminum
1 x 100KHz-1.7GHz RTL-SDR USB Tuner Receiver DIY Kit
1 x USB cable
1 x Antenna