Kilroy_Was_Here on Nostr: For a unique wall hanging not found in any #HamRadio store, consider having this ...

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.