Plain-language answer: Keep an antenna as far from buildings and conductive structures as the site reasonably permits, with safety clearances controlling before RF optimization.
Why it matters in the field
Metal roofs, wiring, gutters, solar systems, HVAC equipment, and reinforced walls can detune the antenna, distort its pattern, add loss, or couple RF into the building.
What to do
Survey the structure, move or rotate the antenna while measuring, route feed line deliberately, and compare noise and tuning at several candidate positions.
The common mistake
Assuming a fixed distance guarantees immunity from every building material and wiring layout.
Field boundary
Current regulations, safety clearances, equipment manuals, exact antenna geometry, and site conditions control. Test the complete installed system at low power before relying on it.
