Hello,
this is a picture of the incoming and awaited RF Explorer Signal Generator unit:

(Spectrum Analyzer on the left, and the new Signal Generator on the right)
I'm testing this amazing tool, that will be available for the end of 2014.
This unit can generate signal starting from 24 Mhz to 6 Ghz (!) and soon will be usable as tracking unit with RF Explorer Spectrum Analyzer using future release of the Windows software.
You can follow my test and experiment via Twitter @giorgiofox