Plug the HackRF into the USB port and use this app to capture and replay signals from frequencies within the range of 1 Mhz to 6 Ghz. The original source code came from Dennis Mantz at https://github.com/demantz/hackrf_android. This version includes GUI buttons and preselected frequency options as well as targets the Android SDK 25 and greater. In order to transmit uncheck amplifier check antenna power turn the LNA slider all the way down and turn the VGA all the way up.