The US Air Force may have shot down an Amateur Radio Pico Balloon over Canada
EME Station 2.0 Part 10 – Antennas On The Tower - Our HAM Station
High Altitude Balloon Antenna Design - Amateur Radio Stack Exchange
Balloon Vertical Omni-Antennas - Resource Detail - The DXZone.com
Radio Waves: BBC radio reporters axed, Ham Radio on BBC Surrey, K6UDA on IC-705 features, and VLF balloon launched with request for detailed reception report | The SWLing Post
Balloon Antenna Doesn't Need A Tower | Hackaday
The Creative Science Centre - by Dr Jonathan P. Hare