ABR allows you to listen airband frequencies as a conventional airband Radio. To work correctly this apps requires an external Realtek RTL2832U Radio Dongle connected on usb port using an OTG cable and the installation of the RTL2832 driver (driver of Martin Marinov to be installed from Play Store). The best performances can be obtained by using an antenna tuned to airband frequencies (118-136MHz).
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minor aesthetic improvements
implementation of a gain control function
improvement of the squelch function