Do you listen to RF spectra on a daily basis? do you have any other equipment besides the gnuradio/Hackrf stuff? have you ever used this... I own 2... http://bit.ly/2kTrXvLDernyn (JD)
I don't listen at all at the moment, mainly because I don't have any good antennas. I have two RTL-SDRs, a HackRF, and AirSpy.