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The horizontal counterpoise wires in my chart are located 10 meters above the surface of the earth. They are not placed on, or in the earth.
The ground rod for the system using the 10-meter ground wire is buried in the earth directly beneath, and 10 meters below the vertical axis of the elevated transmitter and its 3-meter whip.
The 30-ohm r-f resistance I used for it is about typical for such a single ground rod that is buried vertically to a depth of about 8 feet in average soil.
“The antenna” of a Part 15 AM setup necessarily includes all conductors above the surface of the earth that carry r-f current produced by that installation — NOT just the 3-meter whip attached to the transmitter
In the case of elevated Part 15 AM systems using long conducting paths to a functional r-f ground (something buried in the earth), the radiating length of that antenna system can be much greater than the 3 meters authorized to unlicensed operators under FCC §15.219.
