I already know for a fact that satellites cannot be seen. The only man-made object visible is the ISS, which is allegedly as large as two soccer fields.
While many of these objects cannot be seen in visible light, they all emit radio waves that are easily 'seen' by thousands of amateurs on a regular basis.
http://www.svengrahn.pp.se/trackind/trackin1.htm
Here is another repository of observations and tracking information: http://www.n2yo.com/
Stratellites.
This explanation is falsifiable for several reasons. I'm more than happy to expand on any of these, but you don't seem too keen on entertaining the discussion.
1. From the point of view of a terrestrial observer, most of these objects traverse the sky from horizon to horizon in minutes because the objects themselves orbit the Earth in a few hours. And, these objects have very precise and well understood trajectories. See the n2yo link. I can think of no way for a blimp to maintain such extreme, constant velocities. I also can't image how its course wouldn be unaffected by atmospheric turbulence.
2. Radio hams routinely have to compensate for Doppler effects when communicating with these objects, especially the ISS. These effects cannot be faked for all observers. For one thing, you'd have to know exactly who was listening to your stratellite, and when/where they were listening. And, compensating your signal for one observer would disrupt the signal for other observers.
http://www.qsl.net/ah6rh/am-radio/spacecomm/doppler-and-the-iss.html3. If these signals were broadcast from blimps floating above a flat Earth, all of their signals would be detectable to all observers at all times. Radio waves are not absorbed and scattered by the atmosphere in the same way as visible light. UHF and VHF radio waves, for example, are hardly affected by the atmosphere at all. That these signals disappear when the object drops blow the horizon is proof that they are in orbit, not just out of sight.
4. The geometry doesn't work. See: my childish drawing. Replace the Moon with a satellite and the drone with a stratellite. It just wouldn't work.
