World Surveillance Group Inc (fka WSGI)

[guy6]

Army concept and specs:

Here is a link to army site, supporting your point.
Their concept is 1 month station-keeping ability,
and 500 pound payload.
GTEL [theoretically] beats these criteria,
with 18 month station-keeping and 3000 pounds.

http://www.smdc.army.mil/FactSheets/HAA.pdf

GTEL design is certainly more aesthetic than these others.
Shape increases surface area exposed to sun,
[although at an angle part of the day, unless tilted?]
and takes advantage of lift potential from wind.

- guy6