This talk about off-the-shelf hardware in space makes me wonder, given the clear line of sight, if it would be possible to detect their Wi-Fi access points' beacons from Earth. I'm not a "radio guy" and don't know if this would be impossible, simply on the basis of physics, due to the presumably low radiated power from the APs and the limitations of the size of typical antennas on the ground. (Obviously it's possible with the right equipment. We can communicate with the Voyager probes, but that's not with a "can-tenna" and an off-the-shelf Wi-Fi card...)

Edit: Anybody know how difficult it would be to keep an antenna pointed at them? I have no intuition for how fast their transit would be. I assume, since an orbit is around 90 minutes, pretty damned fast.

Edit 2: Some search-engining and back-of-the-envelope not-very-good-at-trig math says the longest possible transit would be about 5 minutes, moving though about 40 degrees of arc / minute. I'm probably completely talking out my ass, though.

It feels like it would be do-able to keep a directional antenna trained on a target moving at that speed.