"N3" wrote in message
oups.com...
Which one of the the two is more efficient as a radiator & why?

1/2 wave vertical fed in the center with coax or one vertical 1/4
wave
with four 1/4 wave radials also fed in the center with coax?

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They are both equally efficient. There's no reason why they should be
otherwise.

Hint : Try not to confuse efficiency with gain.