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I could have sworn this map was already noted on this site but I can’t find it now – must have been lost in the shuffle.
Naturally, a good RF ground system will depend, in part, on the natural phenomenon called “ground conductivity.” This refers to the electrical properties of minerals in the local soil – the “not homogeneous” part.
Yep, I’m jealous of anyone in the 15 – 30 range, I’m sittin’ on a 4 🙁 One of our contributors lived on a 15 for a while – pretty remarkable range there.
Note the conductivity of salt water (5000!) relative to that of earth – no wonder Ken is experiencing such great results up there in the harbor!
Read more at the FCC web site page titled “Map of Effective Ground Conductivity in the USA”