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Practical Antenna Handbook 5/e, 5th Edition by George W. Hippisley, Joseph J. Carr

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CHAPTER 8Multiband and Tunable Wire Antennas

Most communications operators require more than one band, and that makes the antenna problem exactly that—a problem to be solved. Amateur, commercial, and military operators are especially likely to need either multiple antennas for different bands or a multiband antenna that operates on any number of different bands. This situation is especially likely on the high-frequency (HF) bands from 3.5 to 29.7 MHz.

Another problem regards the tunability of an antenna. Some amateur bands are very wide (several hundred kilohertz), and that causes the feedpoint impedance of most antennas to be highly variable from one end of the band to the other. It is typical for amateurs to design an antenna for the portion ...

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