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WR, in my experience with the GM, its best function is far too sensitive to stuff around the antenna for it to work well in a beam type installation. Maybe BM was thinking of a center fed 5/8 wave radiator, like an extended double zepp (EDZ) being used as a driven element for a beam. Maybe in such a setup an EDZ might yield a little gain advantage over a similar 1/2 wave yagi...if it can be matched well.

IMO if this was so, we would already see such beams available.

Even if you installed a raised vertical GM in between two appropriately sized passive elements like a beam setup without a boom, I think the GM would perform poorly. This would be due to the director and reflector being so close. The GM's matching system and the choke does all the work, and if it's skewed by stuff very close by, no telling what might happen. IMO, it won't likely be very good.

<blockquote data-quote="Marconi" data-source="post: 327934" data-attributes="member: 903">WR, in my experience with the GM, its best function is far too sensitive to stuff around the antenna for it to work well in a beam type installation. Maybe BM was thinking of a center fed 5/8 wave radiator, like an extended double zepp (EDZ) being used as a driven element for a beam. Maybe in such a setup an EDZ might yield a little gain advantage over a similar 1/2 wave yagi...if it can be matched well. &nbsp;IMO if this was so, we would already see such beams available.&nbsp;Even if you installed a raised vertical GM in between two appropriately sized passive elements like a beam setup without a boom, I think the GM would perform poorly. This would be due to the director and reflector being so close. The GM&#039;s matching system and the choke does all the work, and if it&#039;s skewed by stuff very close by, no telling what might happen. IMO, it won&#039;t likely be very good.</blockquote>

[QUOTE="Marconi, post: 327934, member: 903"] WR, in my experience with the GM, its best function is far too sensitive to stuff around the antenna for it to work well in a beam type installation. Maybe BM was thinking of a center fed 5/8 wave radiator, like an extended double zepp (EDZ) being used as a driven element for a beam. Maybe in such a setup an EDZ might yield a little gain advantage over a similar 1/2 wave yagi...if it can be matched well. [B][I]IMO if this was so, we would already see such beams available.[/I][/B] Even if you installed a raised vertical GM in between two appropriately sized passive elements like a beam setup without a boom, I think the GM would perform poorly. This would be due to the director and reflector being so close. The GM's matching system and the choke does all the work, and if it's skewed by stuff very close by, no telling what might happen. IMO, it won't likely be very good. [/QUOTE]

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