On Wed, 2 Nov 2016 13:55:40 -0700, John Robertson
wrote:

Interesting that even balloons
were sufficient - so one could launch small weather balloons that have a
maximum height (pin pop by altitude) around a drone? Safe at airports...

Those have also been invented and are known to work well. They're
called "barrage balloons".
https://www.google.com/search?q=barrage+balloon&tbm=isch
Unlike the drone propellers getting tangled with the rubber balloons,
the WWII version had the German bombers smashing into the tethering
cable, suspended nets, or sometimes cables strung between balloons.


--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558