An attempt to send a small, ham-radio equipped balloon across the
Atlantic:

http://www.spiritofknoxville.com/

Balloon design by NG0X if I read the info right. Telemetry on 30
meters.

Which brings up a question:

What are the regulations for such a transmitter? Over the USA is one
thing, FCC has rules for that, but above international waters and
other countries it's a different game, particularly since there's no
operator aboard. The website says the transmitter will be turned off
over the UK.

Just wondering.

73 es GL de Jim, N2EY