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Fred W4JLE wrote:
It would be interesting to recreate the measurements at other locations. My location has 500 feet of sand below me. It would be a great improvement just to have poor soil. Depends on your objective. For NVIS operation with a horizontal antenna, where you need the reflection, that's probably true. But for a vertical or for DX with a horizontal antenna, you're better off with the sand. Perfect ground has no loss; free space has no loss. There's an intermediate quality of ground at which the loss is maximum at a given frequency. Unfortunately, this happens to be in the range of ordinary ground characteristics in the HF range. Your ground should be very low loss. And your pattern should resemble free space, with a very strong field at very low radiation angles. Roy Lewallen, W7EL |
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