rtl-sdr lib with extended gain values : -8.6 -7.7 -6.4 -2.4 3.2 7.3 9.5 13.1 18.1 21.6 27.5 31.9 34.1 38.6 41.0 43.1 44.5 49.3 54.2 57.6 61.1 64.8 To make and install : git clone https://github.com/TLeconte/librtlsdr.git cd librtlsdr mkdir build cd build cmake -DINSTALL_UDEV_RULES=ON -DDETACH_KERNEL_DRIVER=ON -DENABLE_ZEROCOPY=ON .. make sudo make install