andy wrote:
Here is the situation: have an inverted V for 80m and noise level is
S9.. Not good really....
Any advice is welcome. Right now I cant even figure if that roof is
acting like a shield or a big noise-sucking antenna..

If you can somehow get your inverted-V to a horizontal position
for testing, you might be plesantly surprised. At my QTH, going
from an inverted-V to a horizontal dipole at the same center
height lowered my noise level by 2 S-units on 40m.
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73, Cecil http://www.qsl.net/w5dxp