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Radio is electromagnetic radiation (EMR) with a wavelength of 1 mm or above (100000 km is sometimes cited as a "maximum"), i.e., in the frequency range of 300 GHz to 3 kHz. Infrared is adjacent to it on the high-frequency end. The low frequency end, e.g., past 100000 km wavelength, is sometimes called tremendously low frequency and/or subradio.
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