Why it changes the path
It can create weak paths beyond simple geometry, but also raises loss, delay spread, and fading. Frequency and target scale matter.
What to observe
Compare signal variation with movement, polarization, frequency, and environment; do not confuse a scattered path with a stable main lobe.
The common mistake
Claiming a repeatable direct path from one brief scattered signal.
Propagation models and field regions depend on frequency, geometry, terrain, atmosphere, polarization, antenna pattern, and measurement distance. Use them to plan and compare—not to guarantee a contact or installed range.