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IMO, the GM is a center fed 5/8 wave radiator, and the technical indications shows an improved free space pattern over a standard 5/8 wave ground plane. That is the advertised gain advantage.

Like you suggest, in my operations here in Houston I don't see a real benefit with my GM over my Starduster at almost the same height, locally or with DX. I've been comparing them over a year now, but for me all my antennas perform about the same and guys don't like to hear that.

I thought you were doing your radio work like field day work, and thus out of convenience your install was pretty low. How high is your mount?

If you live right on the water and you want to see some real improvement in DX performance, then install a real beam h o r i z o n t a l.

Aluminum takes a real beating that close to salt water and so would a rotor, but that would be my suggestion. Maybe a quad design with some good copper wire that doesn't stretch much, fiberglass and stainless parts would hold up better, but then you have wind to deal with too.

Good luck,

<blockquote data-quote="Marconi" data-source="post: 399273" data-attributes="member: 903">IMO, the GM is a center fed 5/8 wave radiator, and the technical indications shows an improved free space pattern over a standard 5/8 wave ground plane. That is the advertised gain advantage. &nbsp;Like you suggest, in my operations here in Houston I don&#039;t see a real benefit with my GM over my Starduster at almost the same height, locally or with DX. I&#039;ve been comparing them over a year now, but for me all my antennas perform about the same and guys don&#039;t like to hear that. &nbsp;I thought you were doing your radio work like field day work, and thus out of convenience your install was pretty low. How high is your mount? &nbsp;If you live right on the water and you want to see some real improvement in DX performance, then install a real beam h o r i z o n t a l. &nbsp;Aluminum takes a real beating that close to salt water and so would a rotor, but that would be my suggestion. Maybe a quad design with some good copper wire that doesn&#039;t stretch much, fiberglass and stainless parts would hold up better, but then you have wind to deal with too.&nbsp;Good luck,</blockquote>

[QUOTE="Marconi, post: 399273, member: 903"] [B][I]IMO, the GM is a center fed 5/8 wave radiator, and the technical indications shows an improved free space pattern over a standard 5/8 wave ground plane. That is the advertised gain advantage. [/I][/B] [B][/B] [B][I]Like you suggest, in my operations here in Houston I don't see a real benefit with my GM over my Starduster at almost the same height, locally or with DX. I've been comparing them over a year now, but for me all my antennas perform about the same and guys don't like to hear that. [/I][/B] I thought you were doing your radio work like field day work, and thus out of convenience your install was pretty low. How high is your mount? If you live right on the water and you want to see some real improvement in DX performance, [B][I]then install a real beam h o r i z o n t a l.[/I][/B] Aluminum takes a real beating that close to salt water and so would a rotor, but that would be my suggestion. Maybe a quad design with some good copper wire that doesn't stretch much, fiberglass and stainless parts would hold up better, but then you have wind to deal with too. Good luck, [/QUOTE]

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