JLENS to hover above Washington D.C. We had two above Camp Victory in Baghdad when I was there in 2006 and 2008; the ground station for one was in my 'back yard'.

I'd be interested in knowing just how they plan to do it, though. Not only is 10,000 feet of cable a lot of cable (JLENS is tethered), it is also a potential hazard to the aircraft in the area flying below that altitude.