For a unique shack wall hanging not found in any #HamRadio store, consider having this estimated ground conductivity map printed up by a local printer:
fcc.gov/media/radio/m3-ground-…
It's public domain, as almost all US Government stuff is.
M3 Map of Effective Ground Conductivity in the United States for AM Broadcast Stations
Figure R3 of 47 CFR 73.190 of the Commission’s Rules contains a map of the estimated effective ground conductivity in the United States. This data is used to predict the propagation of AM signals across the United States.www.fcc.gov
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