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He told me that he had found around 40 of them so far!

Usually, the sondes keep broadcasting after landing, but this one wasn't. So he quickly guessed that someone else could've taken it. Or maybe it landed in the water and died?

Eventually, we gave up, and walked back to our vehicles. He also is an amateur radio operator, and could answer a couple of questions related to building antennas!

And he was right: Someone had been faster than us! The status was changed: https://radiosondy.info/sonde_archive.php?sondenumber=V2930794