Andrus wrote:
"Any advice is welcome."

Andrus has a bonded metal roof 10x60 mtr which is 17 mtr high.

An automobile contains radio noise within its engine compartment by
using a metal cover. A roof does not completely cover and surround noise
sources within a house, but if it is effectively grounded at the
receiving frequency, the roof can help block transmission of noise into
an antenna mounted above it.

A dipole is balanced and slightly directional. This helps avoid noise
pick up. A balun at the antenna feedpoint helps keep the antenna
balanced and allows connection of coax to run through noisy areas
without pickup.

A low dipole over a reflective surface has a high-angle radiation
pattern, excellent for NVIS.

With an agile antenna tuner you may be able to hear and work stations
within several hundred miles.

Best regards, Richard Harrison, KB5WZI