| 1. | Early DF systems used a loop antenna that could be mechanically rotated.
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| 2. | But the base's radio direction finder only had a single loop antenna.
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| 3. | Other types of loop antennas and random wire antennas are also used.
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| 4. | The single loop antenna was replaced by two antennas, arranged at right angles.
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| 5. | The loop antenna uses this principle in a convenient and mechanically robust form.
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| 6. | Loop antennas can be seen on most pre-1950s aircraft and ships.
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| 7. | These are usually Alford Loop antennas ( see Andrew Alford ).
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| 8. | Resonant loop antennas are relatively large, governed by the intended wavelength of operation.
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| 9. | Later loop antenna designs were enclosed in an aerodynamic, teardrop-shaped fairing.
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| 10. | The loop antennas may be detuned by the steel, just like higher frequencies.
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