The crane is there because of the US airspace laws.. they couldn't legally fly it over 10 feet off the ground without the tether ( it remained slack and did not assist in levitation).. the inventor and founder of the company was on a popular late night radio show called Coast to Coast AM the other night (it's heard by millions worldwide).
The link is here:
[url] http://www.coasttocoastam.com/shows/2007/08/03.html#m[url]
Instability, Unable to see whats below you (landing on children anyone?), and considering most people cant even drive why should they be allowed to take over the air and cause even greater destruction.
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