HR4BTC on Nostr: M3 Map of Effective Ground Conductivity in the United States for AM Broadcast ...

M3 Map of Effective Ground Conductivity in the United States for AM Broadcast Stations:

https://www.fcc.gov/sites/default/files/am_m3_usa_large.tif

#hamradio #amateurradio

quoting
note1t86…qqw8

For a unique wall hanging not found in any #HamRadio store, consider having this estimated ground conductivity map printed up by a local printer:

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

It's public domain, as almost all US Government stuff is.