Hi,
I thought you may be interested in a program I've written, it's a Python
GUI which scans a set of frequencies and plots the resulting levels,
which can be saved for later viewing or exported to a CSV file.
Source:
https://github.com/EarToEarOak/RTLSDR-Scanner
More info:
http://www.eartoearoak.com/software/rtlsdr-scanner
I wrote it to help me find signals over a wide bandwidth, to get a
better view of the RF space. I hope you find it useful.
Al