Some anecdotal evidence that could be useful. In 1988, I operated as
3DA0/ZS6BCR. I used a Butternut HF2V on 160, in the middle of a corrugated
iron barn roof, perhaps 20 x 40 m in size and peaked.
The SWR was very close to what I would have expected for a perfect ground.
The amp wouldn't load, and the exciter cut back to less than 50 W to protect
itself. Yet, I managed to work 35 US stations at sunrise on the first
morning, in about 17 minutes!
Purely anecdotal, but it appears that a metal roof does have some redeeming
features.
Chris R. Burger
ZS6EZ
PS: If you don't do metric units, that barn was about 40 x 80 cubits, or 10
x 20 spans... ;^>
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