From a radio perspective (the physics of tropospheric scatter come into play) the higher the Strat the better. This gives a larger coverage 'footprint' for the WiMAX backhaul needed from the terrestrial ground based Hotzone units.
Plus (and I am not an expert on the dynamics of airship design), but the strat at 65000ft is above weather systems than would otherwise be encountered at say 15000 feet. As a consequence I think there is a station keeping trade-off to be had depending on the operating height of the strat.
All said and done a comms platform at 15000 ft is one useful platform - but the cost model for doing it at this height as opposed to 65000 ft has to be considered
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