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First of all no comparison given dB gain to what? dipole? dummy load? Isotropic raadiator?
Simply gain of an beam is depending on length of the boom, number of elements.
My 2.5 wavelength 2 meter beam from Flexa yagi , 12 elements and excellent design had 12.4 dBd gain.
I have seen omniderectional antenna's for CB seen advertised with over 10 dB gain.....
Most 3 element beams have an gain of 5.5 dBd gain ( over dipole).
Chosing an larger boom length also makes the back less tight, but gain can be max 8.4 dBi never 14.5 ...
Front to back ratio will be lower as well on long boom beams.
Swr for a long boom beam is also narrower as a short boom beam.
Have a read up:
3-Element Yagi (antentop.org)

[QUOTE="Justme, post: 765765, member: 6187"] First of all no comparison given dB gain to what? dipole? dummy load? Isotropic raadiator? Simply gain of an beam is depending on length of the boom, number of elements. My 2.5 wavelength 2 meter beam from Flexa yagi , 12 elements and excellent design had 12.4 dBd gain. I have seen omniderectional antenna's for CB seen advertised with over 10 dB gain..... Most 3 element beams have an gain of 5.5 dBd gain ( over dipole). Chosing an larger boom length also makes the back less tight, but gain can be max 8.4 dBi never 14.5 ... Front to back ratio will be lower as well on long boom beams. Swr for a long boom beam is also narrower as a short boom beam. Have a read up: [URL='http://www.antentop.org/w4rnl.001/3lyg1.html']3-Element Yagi (antentop.org)[/URL] [/QUOTE]

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