Plain-language answer: Polarization rotation is a change in wave polarization during propagation through the ionosphere, reflections, scattering, or changing geometry.
Why it changes the path
It can create mismatch loss or fading between fixed linear antennas and explains why transmitted and received polarization may differ.
What to observe
Compare orthogonal antenna orientations or diversity channels on the same signal and path.
The common mistake
Assuming the transmitting antenna’s polarization arrives unchanged everywhere.
Planning boundary
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.
