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Ok, reduced antenna size to 29' 6" using standard radial setup, and now with a choke below the coax and the antenna is now attached to a thick fiberglass mast instead of steel mast. I had suspected some feedline radiation on the mast and coax, so took these steps to eliminate any stray RF. It seems to have helped.

Now transmit and recieve better on Sirio, the antenna is exactly the same height as the Hygain Penetrator, so far so good, I will evaluate the next few days.

From the man L.B.C himself

"The 5/8-wavelength pattern is usable, but at a lower level than a standard J-pole. The gain at a 6-degree elevation angle is about 2.5 dB lower than for a standard J-pole (2.6 dBi vs. 5.1 dBi).

The lesson that we might take from these models is that the standard-type J-pole's best radiator length is in the vicinity of 1/2 wavelength--as adjusted for the match section requirements and the element diameter."

<blockquote data-quote="supergonzo" data-source="post: 162978" data-attributes="member: 167">Ok, reduced antenna size to 29&#039; 6&quot;&nbsp; using standard radial setup, and now with a choke below the coax and the antenna is now attached to a thick fiberglass mast instead of steel mast. I had suspected some feedline radiation on the mast and coax, so took these steps to eliminate any stray RF. It seems to have helped.Now transmit and recieve better on Sirio, the antenna is exactly the same height as the Hygain Penetrator, so far so good, I will evaluate the next few days.From the man L.B.C himself &quot;The 5/8-wavelength pattern is usable, but at a lower level than a standard J-pole. The gain at a 6-degree elevation angle is about 2.5 dB lower than for a standard J-pole (2.6 dBi vs. 5.1 dBi).&nbsp;&nbsp; The lesson that we might take from these models is that the standard-type J-pole&#039;s best radiator length is in the vicinity of 1/2 wavelength--as adjusted for the match section requirements and the element diameter.&quot;</blockquote>

[QUOTE="supergonzo, post: 162978, member: 167"] Ok, reduced antenna size to 29' 6" using standard radial setup, and now with a choke below the coax and the antenna is now attached to a thick fiberglass mast instead of steel mast. I had suspected some feedline radiation on the mast and coax, so took these steps to eliminate any stray RF. It seems to have helped. Now transmit and recieve better on Sirio, the antenna is exactly the same height as the Hygain Penetrator, so far so good, I will evaluate the next few days. From the man L.B.C himself "The 5/8-wavelength pattern is usable, but at a lower level than a standard J-pole. The gain at a 6-degree elevation angle is about 2.5 dB lower than for a standard J-pole (2.6 dBi vs. 5.1 dBi). The lesson that we might take from these models is that the standard-type J-pole's best radiator length is in the vicinity of 1/2 wavelength--as adjusted for the match section requirements and the element diameter." [/QUOTE]

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