High alt balloons have been used for a long time. Cheap satellite launch.
https://www.universetoday.com/11287/satellites-on-a-budget-high-altitude-balloons/
https://www.youtube.com/watch?v=grLV5bIHSG0
From Antartica:
https://www.youtube.com/watch?v=_5bBvUNEtrI