Thanks Thomas.
I actually do own a lot of professional equipment, mainly TV field meter, encoders and modulators, apart from lots of receivers, dishes, etc. My collection of field meters has more than 20 devices...
I just purchased an SSA3021X, as well.
Why am I writing the software and spending time with this cheap device, if I could just use my R&S, Rover Instruments, Kathrein, Spaun, etc field meter?
The answer is simple: it has been a steep learning curve! I know now more about spectrum analysis than I would by just reading textbooks.
And yes, you are right: the spectrum does not look very good for longer cables. But activating the average function, I could get a readable spectrum for a 100m cable. I put a new entry on my blog.
Also, you are right: I am mostly interested in TV applications and hence wide spans our several megahertz are ok.
Regards