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HiDef, I can't show you a commercial type of GP antenna that isolates their antenna from the mast, but I can show you numerious antennas that don't isolate at all, and in the vast majority of those cases the feed line is just as much. maybe more of the radiating element as the radiator itself.

The goal of isolation is not just to be different, but to isolate (decouple) the raised ground plane as much as possible from the real Earth so the feed line does not radiate. The process of doing this also, to some degree, helps eliminate Common Mode Currents on the feed line by making the differential between Earth ground and the ground potential at the GP system appear with little affect. This is the basic cause of CMC anyway and unless you believe that CMC don't affect the antennas radiating pattern---then no wonder you hold the opinions you talk about. I don't think anyone believes you are not entitled to your opinion.

Since we can't see CMC's or the RF pattern in and our antenna systems we have to rely on the generally accepted science---and that likely won't favor your position that isolation is a relatively worthless consideration. I don't know electrical circuit design, but when I look at it I see a world of isolation ideas incorporated in the design. If that is not true, then just call me foolish.

hang loose

<blockquote data-quote="Marconi" data-source="post: 157336" data-attributes="member: 903">HiDef, I can&#039;t show you a commercial type of GP antenna that isolates their antenna from the mast, but I can show you numerious antennas that don&#039;t isolate at all, and in the vast majority of those cases the feed line is just as much. maybe more of the radiating element as the radiator itself. &nbsp;The goal of isolation is not just to be different, but to isolate (decouple) the raised ground plane as much as possible from the real Earth so the feed line does not radiate. The process of doing this also, to some degree, helps eliminate Common Mode Currents on the feed line by making the differential between Earth ground and the ground potential at the GP system appear with little affect. This is the basic cause of CMC anyway and unless you believe that CMC don&#039;t affect the antennas radiating pattern---then no wonder you hold the opinions you talk about. I don&#039;t think anyone believes you are not entitled to your opinion.&nbsp;Since we can&#039;t see CMC&#039;s or the RF pattern in and our antenna systems we have to rely on the generally accepted science---and that likely won&#039;t favor your position that isolation is a relatively worthless consideration. I don&#039;t know electrical circuit design, but when I look at it I see a world of isolation ideas incorporated in the design. If that is not true, then just call me foolish.&nbsp;hang loose</blockquote>

[QUOTE="Marconi, post: 157336, member: 903"] HiDef, I can't show you a commercial type of GP antenna that isolates their antenna from the mast, but I can show you numerious antennas that don't isolate at all, and in the vast majority of those cases the feed line is just as much. maybe more of the radiating element as the radiator itself. The goal of isolation is not just to be different, but to isolate (decouple) the raised ground plane as much as possible from the real Earth so the feed line does not radiate. The process of doing this also, to some degree, helps eliminate Common Mode Currents on the feed line by making the differential between Earth ground and the ground potential at the GP system appear with little affect. This is the basic cause of CMC anyway and unless you believe that CMC don't affect the antennas radiating pattern---then no wonder you hold the opinions you talk about. I don't think anyone believes you are not entitled to your opinion. Since we can't see CMC's or the RF pattern in and our antenna systems we have to rely on the generally accepted science---and that likely won't favor your position that isolation is a relatively worthless consideration. I don't know electrical circuit design, but when I look at it I see a world of isolation ideas incorporated in the design. If that is not true, then just call me foolish. hang loose [/QUOTE]

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