11. Which of the following improves antenna directivity ?
(a) Driven element
(b) Reflector element
(c) Director element
(d) Parasitic element
12. An antenna with unity gain.
(a) rhombic
(b) half-wave dipole
(c) isotropic
(d) whip
13. Discone radiation pattern is ……….. ?
(a) omnidirectional
(b) unidirectional
(c) bidirectional
(d) figure of eight
14. What is the theoretical gain of a Hertzian dipole ?
(a) 1.76 dB
(b) 2.15 dB
(c) 3 dB
(d) 0 dB
15. The current maximum in a Marconi antenna is found at :
(a) the base of the antenna
(b) the center of the antenna
(c) some point between the base and the center of the antenna
(d) the top of the antenna
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