Plain-language answer: Antenna polarization describes the orientation traced by the radiated electric field, commonly vertical, horizontal, or circular.
Why it changes the result
Mismatch can reduce direct signals substantially, especially on VHF/UHF line-of-sight paths; ionospheric and reflected paths may rotate it.
What to verify
Match the service convention and path, then compare the same stable signal after rotating the antenna where practical.
The common mistake
Assuming polarization never matters because skywave can rotate it.
Complete-system boundary
Match the exact radiator, feed system, return path, frequency, height, orientation, and environment. Connector or thread fit does not establish electrical compatibility, structural capacity, or safe operation.
