Cisco, in their official documentation, talk about weather and fresnel zone. Power lines do not affect line of sight and wireless signals and the Near-far problem has no connexion to wireless bridges. Source : https://www.cisco.com/c/en/us/td/docs/wireless/technology/mesh/8-0/design/guide/mesh80/m_site-preparation-and-planning.html#ID3455
Weather can degrade a mesh link. A Fresnel zone is an imaginary ellipse around the visual line of sight between the transmitter and receiver. It could encounter an obstruction in the Fresnel area which degrading the signal.
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