Dear colleagues, I think that the performance of a RIS array decreases strongly under the influence of atmospheric disturbances such as rain with sand, frost and ice, so we have to clean it every time and therefore effort and colossal equipment must be provided especially if the RIS array is placed in heights such as building walls and skyscrapers.

Perhaps in these cases it is necessary to provide windshield wipers and water on each RIS array like cars.

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