On 3/2/2024 1:56 PM, Dave Curtis wrote:
N6BT has done work to show that the field strength and vertical pattern of
vertical antennas is strongly dependent on ground slope.
73, Jim K9YC
Jim, do you have a pointer to Tom’s work? I’d like to see what he found.
I heard him present it a couple of times at Pacificon in the Antenna Forum.
The executive summary: Testing a vertical dipole on a mesa in AZ,
measuring with a drone, he found field strength in the far field below 0
degrees elevation when the antenna was very near a drop-off (that is,
the edge of the mesa). When the antenna was near drop-offs in different
directions, he worked DX in the direction of the drop-off, but not near
the center of the mesa.
73, Jim K9YC
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