On Mon, 23 Apr 2007 17:30:20 -0700, Roy Lewallen
wrote:

Richard Harrison wrote:
Roy Lewallen, W7EL wrote:
"The attenuation of the ground wave is the same as the free space
attenuation?"

No, it is greater. The attenuation of the ground wave is more rapid
because the soil has resistance and imposes a loss on the passing wave.
. . .

I should hope so. That's why your statement that the field strength
decreases as the inverse of the distance in the context of AM broadcast
measurements at ground level was puzzling.

Richard had been reciting decade-for-decade declines of FS faithfully
from the FCC charts -over seawater- which he had specifically called
out.

"Faithfully" except for an inadvertent substitution of decade miles
for decade kilometers distance.

73's
Richard Clark, KB7QHC