Did the Pentagon Shoot Down a Harmless Ham Radio Balloon? - Scientific American
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
Listening to a Radio Amateur Stratosphere Balloon with an RTL-SDR
Chasing Weather Balloons With Software-Defined Radio - IEEE Spectrum
The Creative Science Centre - by Dr Jonathan P. Hare