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Thanks for this fantastic piece of Python, I had been struggling to find a nice how-to live in a world without GRQX / SDR# (while they are both great).

Currently have a USB RTLSDR dongle attached to my Ubuntu TV server in the garage, doing frequency scans on Ubuntu 14.04.1 on my laptop outside.

Install was simple on a fresh Ubuntu:

sudo apt-get install libusb-1.0*
sudo easy_install pillow

git clone git://git.osmocom.org/rtl-sdr.git
cd rtl-sdr/
mkdir build
cd build/
cmake ../
make
sudo make install

(no reboot)

cd ../../
git clone https://github.com/EarToEarOak/RTLSDR-Scanner.git
sudo apt-get install python python-wxgtk2.8 python-matplotlib python-numpy python-imaging

cd RTLSDR-Scanner/src/

Check dependencies:
python ./rtlsdr_scan_diag.py

If everything passes:
python ./rtlsdr_scan.py

Enter in a hostname, frequency range (I tested a local FM radio station +/- 2Mhz) and away you go.

I'm building a Pi2B portable SDR unit with some decoder functionality, this scanner fits perfectly.
For anyone else interested, one of the other pieces is this lovely gnuwaterfall python GIT: https://github.com/simeonmiteff/gnuwaterfall/

Al, my only critique, the start button in the bottom left looks like a drop down list but clicking it only responds as a button, am I missing a drop down list here?