At one mile altitude your line-of-site distance to the horizon is about 90 miles. Hot air balloons can reach higher than 12 miles altitude so your only problem would be length and weight of cable if the balloon was to be tethered to the ground, and some sort of drogue chute or rudder arrangement to keep your directional antenna pointing in the right direction.
If you're using a lifting medium other than hot air, there are additional complications. Hydrogen isn't too hard to produce but storage in a Twilight War scenario might be problematic and of course it's horribly dangerous to use where there's any chance of electrical discharge or naked flame. Helium is the preferred option and is the lifting gas used in the dirigibles described in the Airlords of the Ozarks module but once existing stocks are gone, they're bloody hard to replace in a post-industrial scenario.
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 "It is better to be feared than loved" - Nicolo Machiavelli
Last edited by Targan; 06-26-2013 at 08:45 PM.
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