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=== Radio frequency ===
{{main|Radio frequency}}
{{radio_spectrum}}▼
[[Image:Atmospheric electromagnetic transmittance or opacity.jpg|thumb|right|350px|Plot of Earth's atmospheric transmittance (or opacity) to various wavelengths of electromagnetic radiation.]]
[[Radio]] waves generally are utilized by [[antenna (radio)|antennas]] of appropriate size (according to the principle of [[resonance]]), with wavelengths ranging from hundreds of metres to about one millimetre. They are used for transmission of data, via [[modulation]]. [[Television]], [[mobile phone]]s, [[wireless networking]] and [[amateur radio]] all use radio waves.
▲{{radio_spectrum}}
=== Microwaves ===
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