[Elecraft] ARRL book on receiving antennas

[Jim Brown]

On 9/9/2018 12:39 PM, Bob McGraw K4TAX wrote:
> How does one measure transmit antenna efficiency?

Not easily. :)  But NEC provides quite good predictions IF the antenna 
is completely and accurately described in the model. For verticals, that 
includes ground quality. For all antennas it includes height above 
ground, counterpoise, radial systems, and transmission lines.

AND -- propagation reporting systems like WSPR and the Reverse Beacon 
Network (RBN) can provide very good comparisons between antennas IF a 
LOT of reports from  a LOT of stations is averaged over a LOT of time.

73, Jim K9YC