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On the VHF and UHF bands, polarization of the receiving antenna is very important in relation to the transmitting antenna, yet on HF bands it is relatively unimportant. Why is that so?
The ionosphere can change the polarization of the signal from moment to moment
Reflections from the irregular, changing ionosphere often randomize the polarization of HF skywave signals (Faraday rotation). On VHF/UHF line-of-sight paths, polarization remains relatively constant.
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