Rabbit73,
I purchased three of these (SDR’s) directly from China and find them very useful. All of the spectrum analyzer graphics I post are captured through one of my SDR’s using a free program called RTLSDR Scanner. They only have ~50 dB dynamic range, but are capable of seeing signals down to ~-114 dBm. I wrote about my initial experiences here:
http://www.highdefforum.com/local-hd...r-10-00-a.html