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SW, I plan to compare my Sigma4 vs. my GM. I don't think you do side by side testing, but did you have the antennas at the same height at the coax connections or were they staged some other way?

I haven't decided yet how I want to set mine up in that case, but I've found in the past, doing side by side, that the longer antenna always wins when the feed points are the same height, and the shorter radiator always wins when the antenna tips or the same height.

If I lower my GM so that the tip is no higher than the AstroPlane tip, then the GM is at a real disadvantage with the bottom being close to something on the ground or house. No way the GM can equal the AP. However, if I put the GM and the AP at the same feed point height, no way the AP can compete with the top of the GM towering almost 18' feet above the AP. The difference is not as much as one might think, but the GM is superior with both coax connections at the same height. I do think in this situation the GM will really shine at longer distances however. In fact right now I have the antennas about centered together in height with the tip of the GM about 8' feet above the AP. The GM shows better signals the further out the stations is which I would expect. I haven't been able to do much comparison work in this configuration, but every time conditions get real quiet, I test if I can hear someone on the air. I will switch the antennas and compare signals before going on to another antenna combination with the GM.

<blockquote data-quote="Marconi" data-source="post: 246297" data-attributes="member: 903">SW, I plan to compare my Sigma4 vs. my GM. I don&#039;t think you do side by side testing, but did you have the antennas at the same height at the coax connections or were they staged some other way? &nbsp;I haven&#039;t decided yet how I want to set mine up in that case, but I&#039;ve found in the past, doing side by side, that the longer antenna always wins when the feed points are the same height, and the shorter radiator always wins when the antenna tips or the same height. &nbsp;If I lower my GM so that the tip is no higher than the AstroPlane tip, then the GM is at a real disadvantage with the bottom being close to something on the ground or house. No way the GM can equal the AP. However, if I put the GM and the AP at the same feed point height, no way the AP can compete with the top of the GM towering almost 18&#039; feet above the AP. The difference is not as much as one might think, but the GM is superior with both coax connections at the same height. I do think in this situation the GM will really shine at longer distances however. In fact right now I have the antennas about centered together in height with the tip of the GM about 8&#039; feet above the AP. The GM shows better signals the further out the stations is which I would expect. I haven&#039;t been able to do much comparison work in this configuration, but every time conditions get real quiet, I test if I can hear someone on the air. I will switch the antennas and compare signals before going on to another antenna combination with the GM.</blockquote>

[QUOTE="Marconi, post: 246297, member: 903"] SW, I plan to compare my Sigma4 vs. my GM. I don't think you do side by side testing, but did you have the antennas at the same height at the coax connections or were they staged some other way? I haven't decided yet how I want to set mine up in that case, but I've found in the past, doing side by side, that the longer antenna always wins when the feed points are the same height, and the shorter radiator always wins when the antenna tips or the same height. If I lower my GM so that the tip is no higher than the AstroPlane tip, then the GM is at a real disadvantage with the bottom being close to something on the ground or house. No way the GM can equal the AP. However, if I put the GM and the AP at the same feed point height, no way the AP can compete with the top of the GM towering almost 18' feet above the AP. The difference is not as much as one might think, but the GM is superior with both coax connections at the same height. I do think in this situation the GM will really shine at longer distances however. In fact right now I have the antennas about centered together in height with the tip of the GM about 8' feet above the AP. The GM shows better signals the further out the stations is which I would expect. I haven't been able to do much comparison work in this configuration, but every time conditions get real quiet, I test if I can hear someone on the air. I will switch the antennas and compare signals before going on to another antenna combination with the GM. [/QUOTE]

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