On the go (OTG ) cables and RTL-SDR receivers are available on ebay
If you’ve ever been curious about software defined radio (SDR), this USB stick is the easiest way possible to have fun with a powerful, configurable receiver. Packed with the powerful RTL2832U and R820T tuner, it can tune into signals from 24MHz to 1850MHz. That means you can use a computer (with Windows, Mac, or Linux) to tune into: FM Radio, AM signals (but not AM radio), CW (morse code!), unencrypted radio signals (such as those used by many police and fire departments), POCSAG pagers, and more.
Works with Android Software Located Here Here
Android Software allows viewing ADS-B traffic on your tablet or mobile device with the ADS-B on USB receiver. Overlays aircraft traffic (lat/Lon/Alt) on moving openstreetmap or WAC/SEC/TAC maps. additionally you can use Low Enroute IFR Charts.
Uses Generic RTL2832U with Rafael Micro R820T tunner.
Android Tablet with support OTG usb interface and OTG cable
DVB-T dongles based on the Realtek RTL2832U can be used as a cheap SDR, since the chip allows transferring the raw I/Q samples to the host, which is officially used for DAB/DAB+/FM demodulation. more info here RF-Connect.com
http://www.rtl-sdr.com/ – a blog with tons of information, ideas and projects
http://rtlsdr.org/ – a nice resource with links to software.
Comes with a very compact (but very good quality) RTL2832+R820T module with an MCX RF connector, and a basic ‘DVB-T’ antenna (used to tune into DVB TV signals, not available in the US but will work in Europe or any country with DVB-T broadcasts) as well as an IR remote which isn’t terribly useful. The antenna seems OK for basic experimentation. We also have some MCX to BNC and MCX to SMA adapters (see below) which you may want to use to connect a better antenna.
Antennae Length: 120.65mm / 4.75″
Wire Length: 1168.4mm / 46″
USB Dongle: 22.24mm / 0.87″ x 23.1mm / 0.9″ x 9.9mm / 0.38″