Simulation of a car above ground having a dipole antenna on its roof.
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Simulation of a plane wave reaching the path of an airplane.
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This simulation shows a wire grid model of a ship sailing in the ocean and having two dipole antennas at its top.
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A half-wave dipole would have a length of 40 meters in this band (3.75 MHz), difficult to install at home due to lack of space. A spiral loop is attractive for its small size and relative ease of tuning because it is basically an inductor to which a variable capacitor is connected at the feed point to achieve resonance.
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