| 41. | The system requires a carefully aimed directional antenna.
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| 42. | It uses a directional antenna at all times.
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| 43. | For broadcasting stations, directional antennas are often required.
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| 44. | The 720 kHz transmitter was fitted with a directional antenna that minimized propagation of signals westward.
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| 45. | CKOR uses a non-directional antenna at all times.
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| 46. | Beam steering and directional antennas also facilitate increased system performance by providing isolation between remote radios.
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| 47. | The rotating ship could use an omni-directional antenna.
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| 48. | Night used a three tower directional antenna system.
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| 49. | Between the tunnels, directional antennas were used.
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| 50. | ARDF events use attenuator, and directional antenna.
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