[Elecraft] OT - anyone have experience with effects of, metal roofs on antenna performace?

[eric manning]

On another angle, I have a 2-element vertical array [Christman feed, 
BIP-BOP]
for 40m sitting on topof a [large] flat metal roof.

It works FB, perhaps in part because the steel roof provides a
nearly-perfect ground plane ??

Eric VA7DZ

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