Probably not until told. I believe 180' is the highest you can normally fly a
kite.
Not even close! The afghans would get their bamboo and tissue kites regularly to at least 1000'.
Amazing how much damage a little 'string' can cause.
The aerostats themselves are even hard to spot, they blend into the sky remarkably well, but the cables are VERY hard to see unless the baloon tips you off.