[Elecraft] ARRL book on receiving antennas

[Bob McGraw K4TAX]

That's one of the reasons I asked the question.  Normally antenna efficiency is measured in an RF anechoic chamber. I'm not aware of one suitable in size for HF antennas. 

Bob, K4TAX


Sent from my iPhone

> On Sep 9, 2018, at 3:52 PM, Jim Brown <jim at audiosystemsgroup.com> wrote:
> 
>> 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
> 
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