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Externet

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Greetings and wishes for a much better 2021.

Some of you may have all the advanced tools, programs and knowledge to design antennas. Whenever you feel bored; could you please share a design of a high gain collinear (~8+ element ?) omnidirectional wideband receiving antenna for 400 to 700MHz ? -Not made with coaxial cable sections- or as good as possible. Thank you.
 
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vfone

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A classical collinear antenna is made by using λ/2 elements, which makes the antenna to be narrow band.
There are few aproaches to increase the antenna bandwidth using various shapes for the antenna elements, but the resulting bandwidth will be not greater than 10%.
 

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