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Henry, practice shows it that building and roof is not netral when it is located below antenna. Height depends on frequency of course.

Simple example.
My friend have 8 element Yagi for 10m. When antenna is in specific direction 1/3 of it is over a building which is 8m below. In that direction it is easily noticable that resonance and SWR is changing.
Mike

[QUOTE="sp5it, post: 476564, member: 10249"] Henry, practice shows it that building and roof is not netral when it is located below antenna. Height depends on frequency of course. Simple example. My friend have 8 element Yagi for 10m. When antenna is in specific direction 1/3 of it is over a building which is 8m below. In that direction it is easily noticable that resonance and SWR is changing. Mike [/QUOTE]

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