Cool stuff!
I love the antenna setup on the balloon - looks like copper foil on a clear plastic substrate or something. All kinds of stuff going on there.
Too bad you didn't expand out the 10 kHz data signal on your waterfall display - I wonder if you'd have been able to see some FDM structure within it, to get a sense of what kind of modulation they might have been using.
Very nice catch...
Cool shack, too. In the night picture with the clock and world map on the wall behind the desk, that looks like you have a giant video display back there, like in a situation room or something.
I especially like the Heathkit gear (I miss my old DX-60B!) and the 440 MHz log periodic, right there so you can do Satcomm from poolside!