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I think Henry pretty well nailed it. I think he can be considered an 'expert witness' since he is an antenna builder/mfr. Specializing in beam antennas in particular.

His conclusions may be of interest to BammBamm's consideration: to put a Sirio 2016 above a horizontal beam. Which is what originally what inspired Booty's thread here.

From what I can gather from Henry's explanation, the 2016 with the short radials might be possible to use if it is high enough above the horizontal beam. But as for regular length ground planes (1/4 wave length) above a horizontal beam; it would vastly affect the beam's performance, tune, and lobe characteristics.

Personally, with so much at risk (affecting both antennas to various degrees) for the amount of work and expense involved, I would do it with a Imax/A99 w/o radials above a horizontal beam. But that is about it.

<blockquote data-quote="Robb" data-source="post: 299688" data-attributes="member: 8446">I think Henry pretty well nailed it.&nbsp; I think he can be considered an &#039;expert witness&#039; since he is an antenna builder/mfr.&nbsp; Specializing in beam antennas in particular.His conclusions may be of interest to BammBamm&#039;s consideration: to put a Sirio 2016 above a horizontal beam.&nbsp; Which is what originally what inspired Booty&#039;s thread here.From what I can gather from Henry&#039;s explanation, the 2016 with the short radials might be possible to use if it is high enough above the horizontal beam.&nbsp; But as for regular length ground planes (1/4 wave length) above a horizontal beam; it would vastly affect the beam&#039;s performance, tune, and lobe characteristics.Personally, with so much at risk (affecting both antennas to various degrees) for the amount of work and expense involved, I would do it with a Imax/A99 w/o radials above a horizontal beam.&nbsp; But that is about it.</blockquote>

[QUOTE="Robb, post: 299688, member: 8446"] I think Henry pretty well nailed it. I think he can be considered an 'expert witness' since he is an antenna builder/mfr. Specializing in beam antennas in particular. His conclusions may be of interest to BammBamm's consideration: to put a Sirio 2016 above a horizontal beam. Which is what originally what inspired Booty's thread here. From what I can gather from Henry's explanation, the 2016 with the short radials might be possible to use if it is high enough above the horizontal beam. But as for regular length ground planes (1/4 wave length) above a horizontal beam; it would vastly affect the beam's performance, tune, and lobe characteristics. Personally, with so much at risk (affecting both antennas to various degrees) for the amount of work and expense involved, I would do it with a Imax/A99 w/o radials above a horizontal beam. But that is about it. [/QUOTE]

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