[TowerTalk] New N6LF Ground Probe Designs

[Jim Brown]

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