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The
"resonant frequency" and "electrical resonance"
is related to the electrical length of the antenna. The electrical
length is usually the physical length of the wire divided by its
velocity factor (the ratio of the speed of wave propagation in the
wire to c0, the speed of light in a vacuum). Typically an antenna
is tuned for a specific frequency, and is effective for a range
of frequencies usually centered on that resonant frequency. However,
the other properties of the antenna (especially radiation pattern
and impedance) change with frequency, so the antenna's resonant
frequency may merely be close to the center frequency of these other
more important properties.
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