To go on about the antenna, the current is the main parameter that radiates the energy into the surrounding meduim.
On a base loaded shortened antenna, the current is the greatest at the base above the loading coil and tapers off up the whip to 'near' zero (low value) at the top.
Other configurations just alter this current distribution along the length of the radiator whip such as center loading and top loading.
The voltage distriubtion is about oppisite of the current.
Lastly, the vertical ''''' ANTENNA'''''' is only half of the system.
The metal around it is the other half because the power alternates between the radiating element and the ground structure around it due to capacitive coupling between the whip and the metalic ground near it..
If you were to mount an antenna on a wood structure, you would never get a match proving 'antenna' is only half of the system and needs the other metalic half.
This only applies to vertical type single radiator antennas and certain other configurations that work like a verticles.
Beams, dipoles, loops, quads in vertical or horizontal mountings and 'ground planes with there own radials' are complete as they are made and are only influenced by elevation above ground that changes their feed impedence and radiation angles with height.
Believe it, there is a lot of complex knowledge behind all this such that it is easy to fall prey from the uninformed if you have no knowledge at all.
.
Like the truck driver hauling a load of birds. He tells you he hits the trailer with a stick to make the bird fly around inside the trailer so the load gets lighter pulling a hill. Sounds good, right! Believe that one and there is another waiting to be told.
Good luck.
On a base loaded shortened antenna, the current is the greatest at the base above the loading coil and tapers off up the whip to 'near' zero (low value) at the top.
Other configurations just alter this current distribution along the length of the radiator whip such as center loading and top loading.
The voltage distriubtion is about oppisite of the current.
Lastly, the vertical ''''' ANTENNA'''''' is only half of the system.
The metal around it is the other half because the power alternates between the radiating element and the ground structure around it due to capacitive coupling between the whip and the metalic ground near it..
If you were to mount an antenna on a wood structure, you would never get a match proving 'antenna' is only half of the system and needs the other metalic half.
This only applies to vertical type single radiator antennas and certain other configurations that work like a verticles.
Beams, dipoles, loops, quads in vertical or horizontal mountings and 'ground planes with there own radials' are complete as they are made and are only influenced by elevation above ground that changes their feed impedence and radiation angles with height.
Believe it, there is a lot of complex knowledge behind all this such that it is easy to fall prey from the uninformed if you have no knowledge at all.
.
Like the truck driver hauling a load of birds. He tells you he hits the trailer with a stick to make the bird fly around inside the trailer so the load gets lighter pulling a hill. Sounds good, right! Believe that one and there is another waiting to be told.
Good luck.
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