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yoshy-
Pretty sure I also heard that satellite blocking technology is getting more sophisticated. So your super expensive satellite may be rendered ineffective. Whereas a low tech balloon can be less easily blocked.
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Assume you can also predict very accurately when a satellite will be overhead and stop doing stuff/hide it. A balloon/drone can bob about for a bit and is less predictable.
hugo7
c00ps
Why are countries using balloons in the first place? Surely satellites are a bit more reliable, better quality and more 'secret' than a balloon wafting along...