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You can't just go launching balloons. Its Illegal!
I live in the UK. I would have to travel a very long way to find free airspace. Right now at home the limit above me is Flight Level 55. As I travel towards London that diminishes to just 2500 feet. Over London is no go full stop. Up towards Birmingham I get FL 105. 10500' isn't going to prove very much. Its all air-spaced off ... CLASS A only. Just adds more weight to the conspiracy I suppose.
This is false, you can launch balloons through legal means. I believe the only states that have those laws are as follows:
Connecticut, Florida, Tennessee, New York, Texas, California and Virginia.
Cities of Ocean City, Maryland; Louisville; Huntsville, Ala.; San Francisco; and Baltimore.
Legislation is pending in other states including Massachusetts, Maryland, and New York.
Do some research. And I would do it regardless lol.. It's highly unlikely the FEDS are going come knocking on my door for releasing a weather balloon and retrieving it unless it hits an airplane lol.