The Circumnavigators: アマチュア無線気球が巨大な世界を飛ぶ
Note: Many thanks to Ralph W0RPK for all the work on tracking these circumnavigating amateur radio balloon flights and providing updates to this page. As of the end of 2016, there were still several balloons in the air on multiple laps. The number of long duration balloon projects is increasing all the time. The workload…