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I fail to see the point since the collinear effect only becomes useful once the radiator is longer than 1/2 wavelength. The sleeve dipole has no phase delay between the source and the main vertical radiator since it's directly connected to it, appearing more like a center feed antenna to RF. Not the case at all in the Sigma where we have delay between the source and the upper 1/2 wave.

[QUOTE="Shockwave, post: 494738, member: 10882"] I fail to see the point since the collinear effect only becomes useful once the radiator is longer than 1/2 wavelength. The sleeve dipole has no phase delay between the source and the main vertical radiator since it's directly connected to it, appearing more like a center feed antenna to RF. Not the case at all in the Sigma where we have delay between the source and the upper 1/2 wave. [/QUOTE]

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