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<p>enclosure (if any), etc., in addition to the actual <a href="page.php?w=Radio_frequency">RF</a> current-carrying components. A receiving antenna may include not only the passive metal receiving elements, but also an integrated preamplifier or <a href="page.php?w=frequency_mixer">mixer</a>, especially at and above <a href="page.php?w=microwave">microwave</a> frequencies.</p>

<p><big>Overview</big></p>
<p>Antennas are required by any radio receiver or transmitter to couple its electrical connection to the electromagnetic field. <a href="page.php?w=Radio">Radio</a></p><p>
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