You will experience considerable differences between vertical and horizontal mounting, especially at low height above the ground. Vertical tends to perform better at low heights.
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I'd suggest modelling it for yourself, in order to see the effects, as it's too complicated to describe in detail in just a few paragraphs.
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4nec2 is free and you should be able to master the basics in a few hours. There is also a library of standard antenna designs
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Regards,
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Martin
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