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$\begingroup$ The impedance of the conducting path leading from an elevated "Halo" TO whatever serves as the actual EMP/r-f/a-c ground such as one or more conductor(s) buried in the earth has a large bearing on the performance of such protection systems. Is there a recommended upper limit for the impedance of such systems, including the impedance of the buried conductors? $\endgroup$
– Richard Fry
Commented Jan 30, 2019 at 11:04
$\begingroup$ @RichardFry I added some industry best practice information to my answer. $\endgroup$
– Glenn W9IQ
Commented Jan 30, 2019 at 11:41
$\begingroup$ The question seems to refer mainly to the exterior ring. Do you have any guidance on how it should be constructed? $\endgroup$
– mrog
Commented Jan 30, 2019 at 16:57

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