Giovanni wrote:
I have the possibility to run a 450hom ladder line from the rooftop
down to the shack in the basement of the house, through an unused
chimney made of a steel pipe of about 1 foot of diameter and about 20
feet long.

The ladder-line needs to be centered in that 1 foot diameter
steel pipe. Otherwise, the fields are likely to become unbalanced
and losses occur. 6 inch spacing away from any conductive medium
is just about right.
--
73, Cecil http://www.qsl.net/w5dxp


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