Looks like they have algorithmic issues with the software signal processing. I can't read the scales accurately, but the spacing of the nulls looks suspiciously like the maximum sampled bandwidth of these sticks. Perhaps they didn't take the anti-aliasing filter into account, or worse. Regardless, this is obviously a work in progress.
I finally was able to pickup a DVBT for like 7 bucks on amazon and gave this little guy a shot. This works amazingly awesome. No receiver is required but you do need to get power to the LNB. I am fortunate enough to have one of those 13 to 18 power inserters so I was able to get power to the LNB that way. This works very well and all you have to do is find the LBand frequency's. This even works with ATSC signals in tKkkhe UHF and VHF range. Technically any signal in that freq range. I just wish that It did the full Lband sweep versus 300 mhz only, but irregardless it will get you on and you can fine tune from there. This is a very nice setup and you dont need to spend 3,000 plus on a spectrum analyzer. You cant beat the value of 7 bucks and free software to do the job.
Now, is the paid version worth it and whats the differences?