The B-64 balloon launched on 12 July 2014 from Silverstone, UK is still in the air transmitting on 434.500 MHz using Contestia 64/1000 and APRS.
On Saturday 3 October 2014, Phil Heron MI0VIM reported decoding data while it was over the North Atlantic ocean, coming up to the sixth time it would pass over the United Kingdom on it's continuing journey.
The B-64 balloon was built by ham radio amateur Leo Bodnar M0XER, he made both the plastic foil envelope and the solar powered transmitter payload which weighs just 11 grams.
B-64 track - http://habhub.org/mt/?focus=B-64
B-64 completes first journey around the world - http://amsat-uk.org/2014/07/31/434-mhz-balloon-b-64-completes-epic-journey/