[600MRG] New Hi-Res Map of Effective Ground Conductivity in the USA

[sbjohnston at aol.com]

New Hi-Res Map of Effective Ground Conductivity in the United States


https://www.fcc.gov/media/radio/m3-ground-conductivity-map
 



Steve WD8DAS / WH2XHY

sbjohnston at aol.com
http://www.wd8das.net/
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