On 2015-04-24, Ian Jackson wrote:

See
http://www.allsopp.co.uk/

Those are pretty sophisticated balloons. Bet those are similar to the
aerostats the US uses around the Gulf of Mexico for surveillance purposes.
Those are tethered and go up thousands of feet and are marked on our
aeronautical charts. Prices must be high on those, out of the limits of the
average ham here. hi

73 ...Edwin, KD5ZLB
__________________________________________________ __________
"Once you have flown, you will walk the earth with your eyes
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return."-da Vinci http://www.kd5zlb.org