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1 E layer: The next layer beyond the D layer is called the E layer. 2  This exists at an altitude of between 100 and 125 km. 3  Instead of acting chiefly as an attenuator, this layer reflects radio signals although they still undergo some attenuation.
Radio waves lie at the low-frequency end of the electromagnetic spectrum. They are primarily used in various types of communications signals. Also of importance is the detection of natural radio sources in radio and radar astronomy.