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If I'm looking at the pictures correctly, the problem is that the mast that the driven vertical element is attached to is metal which is also connected to the groundplane. That section should be non-conductive...like a piece of heavy fiberglass rod. Then you use the matching coils between the driven vertical elent and the groundplane radials. The radials can be attached directly to the mast. In your picture, I don't see any insulation in between the vertical element and the radials (matching coil not included). Look at this picture to see what I'm referring to. Even though this antenna uses a type of Beta match, it's the same principle: Double Trombone Impedance Matching System

BTW, I moved this thread to the CB Antennas section thinking that was the intended application, but it can certainly be moved back if it makes a difference to you.

<blockquote data-quote="Moleculo" data-source="post: 142078" data-attributes="member: 1">If I&#039;m looking at the pictures correctly, the problem is that the mast that the driven vertical element is attached to is metal which is also connected to the groundplane. That section should be non-conductive...like a piece of heavy fiberglass rod. Then you use the matching coils between the driven vertical elent and the groundplane radials. The radials can be attached directly to the mast. In your picture, I don&#039;t see any insulation in between the vertical element and the radials (matching coil not included). Look at this picture to see what I&#039;m referring to. Even though this antenna uses a type of Beta match, it&#039;s the same principle: <a href="http://www.a1antennas.com/trombone.html" target="_blank">Double Trombone Impedance Matching System</a>&nbsp;BTW, I moved this thread to the CB Antennas section thinking that was the intended application, but it can certainly be moved back if it makes a difference to you.</blockquote>

[QUOTE="Moleculo, post: 142078, member: 1"] If I'm looking at the pictures correctly, the problem is that the mast that the driven vertical element is attached to is metal which is also connected to the groundplane. That section should be non-conductive...like a piece of heavy fiberglass rod. Then you use the matching coils between the driven vertical elent and the groundplane radials. The radials can be attached directly to the mast. In your picture, I don't see any insulation in between the vertical element and the radials (matching coil not included). Look at this picture to see what I'm referring to. Even though this antenna uses a type of Beta match, it's the same principle: [URL="http://www.a1antennas.com/trombone.html"]Double Trombone Impedance Matching System[/URL] BTW, I moved this thread to the CB Antennas section thinking that was the intended application, but it can certainly be moved back if it makes a difference to you. [/QUOTE]

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