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I’m struck between the similarity between this and the big antenna (?) array that the ballon that went over the USA carried…

That thing flew over/near Malmstrom Air Force Base (ICBM silos.)

Using OpenStreetMap data to map stuff the balloon flew near: https://youtu.be/sQ_sEWodIrc?si=LUfvRR4kvlqQyrZ1&t=16

I had never heard of this MUNDUS tool before, but it looks like a very interesting project.

Imagine using multiple Project Loon balloons as a giant SAR.