[Elecraft] ARRL book on receiving antennas

[Jim Brown]

On 9/9/2018 1:03 PM, Mel Farrer via Elecraft wrote:
> VERY CAREFULLY on an antenna range for that purpose.  You can model it and get an idea of what it should be, but it is installation specific.

AND the test ranges required for HF and MF antennas occupy a lot of land 
with well defined and consistent soil quality. We're talking tens and 
hundreds of square miles, the ability to make calibrated measurements in 
three dimensions, and military budgets.

I'm aware of several excellent antenna engineers who have done some 
great work with drones to measure antenna DIRECTIVITY. but efficiency is 
another BIG step up in both complexity and cost.

73, Jim K9YC