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The ground rods create a ground plane under the antenna which increases the gain. The ground rods may extend horizontally from the base, but in antennas fed by coaxial cable as shown here they are usually sloped downward to increase the radiation resistance of the antenna from the 36 ohms of a quarter wave monopole closer to 50 ohms, so the ...
English: Diagram showing why a monopole antenna has the same radiation pattern as a dipole antenna, with twice the radiated power.When a monopole antenna, (a) is mounted over a perfectly conducting ground plane such as the Earth, the radio waves can reach a given point P by two paths, either propagating directly in a straight line to P, or reaching P after first reflecting from the plane (blue ...
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