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Hello to all,

I tried to model this mobile antenna https://www.wimo.com/en/62006 with the 1123 antenna base in EZNEC, shortened according this table to 404MHz.
[ATTACH]70861[/ATTACH][ATTACH]70863[/ATTACH]

It is designed to be a colinear stacked 1/4λ+1/2λ antenna. My focus was to model the geometry as exact as possible.
But I have two questions:

1. As I have modeled the helix quite exact, will EZNEC then automatically calculate the inductivity / capacity in its modeling? The value for the helix would be 0.519µH and 1.168pF.

2. How can I model a car roof in EZNEC?

Some more background information: I want to use this antenna for DAB+ reception (174-230MHz) and want to know how it behaves as a colinear stacked 1/8λ+1/4λ antenna for 202MHz.

Some help / advice is appreciated. Thanks in advance.

Best regards
Oliver

<blockquote data-quote="Blue_Max" data-source="post: 848784" data-attributes="member: 20102">Hello to all,I tried to model this mobile antenna <a href="https://www.wimo.com/en/62006" target="_blank">https://www.wimo.com/en/62006</a>&nbsp; with the 1123 antenna base in EZNEC, shortened according this table to 404MHz. [ATTACH]70861[/ATTACH][ATTACH]70863[/ATTACH]It is designed to be a colinear stacked 1/4λ+1/2λ antenna. My focus was to model the geometry as exact as possible. But I have two questions:1. As I have modeled the helix quite exact, will EZNEC then automatically calculate the inductivity / capacity in its modeling? The value for the helix would be 0.519µH and 1.168pF.2. How can I model a car roof in EZNEC?Some more background information: I want to use this antenna for DAB+ reception (174-230MHz) and want to know how it behaves as a colinear stacked 1/8λ+1/4λ antenna for 202MHz.Some help / advice is appreciated. Thanks in advance.Best regardsOliver</blockquote>

[QUOTE="Blue_Max, post: 848784, member: 20102"] Hello to all, I tried to model this mobile antenna [URL]https://www.wimo.com/en/62006[/URL] with the 1123 antenna base in EZNEC, shortened according this table to 404MHz. [ATTACH]70861[/ATTACH][ATTACH]70863[/ATTACH] It is designed to be a colinear stacked 1/4λ+1/2λ antenna. My focus was to model the geometry as exact as possible. But I have two questions: 1. As I have modeled the helix quite exact, will EZNEC then automatically calculate the inductivity / capacity in its modeling? The value for the helix would be 0.519µH and 1.168pF. 2. How can I model a car roof in EZNEC? Some more background information: I want to use this antenna for DAB+ reception (174-230MHz) and want to know how it behaves as a colinear stacked 1/8λ+1/4λ antenna for 202MHz. Some help / advice is appreciated. Thanks in advance. Best regards Oliver [/QUOTE]

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