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The measurement method in the Handbook is seriously flawed. You will
almost always measure something many times better than the soil really is at radio frequencies. Since soil conductivity varies widely over small distances, and since it also has seasonal variations, a rough guess from a book is about as good as anything. Myself, I don't worry about it. I just use average soil in models. 73 Tom Thanks for your comments Tom, and you raise some valid points. Jerry Sevick "The Short Vertical Antenna and Ground Radial", pp 25, 26, does state that the procedure is accurate to within 25%, but does not provide any independant verification of these claims. The method was developed by M. C. Waltz at Bell Labs, but, again, nothing was ever published. It would be interesting to develop a more accurate method. While my measurement of 52 mS/m may not be very realistic it is evident that this region does have a very high soil conductivity. Ground-wave daylight reception of AM broadcast stations, with strong signals, at well over 300 miles is possible. 73, Frank |