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[–] prairie 0 points 2 points (+2|-0) ago  (edited ago)

Extremely High Frequency waves don't propagate well.

Compared to lower bands, radio waves in this band have high atmospheric attenuation: they are absorbed by the gases in the atmosphere. Therefore, they have a short range and can only be used for terrestrial communication over about a kilometer. Absorption by humidity in the atmosphere is significant except in desert environments, and attenuation by rain (rain fade) is a serious problem even over short distances.

At typical power densities they are blocked by building walls and suffer significant attenuation passing through foliage.