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Whichever version you get, I would be SURE to assemble it exactly to the specified lengths.  SIrio uses the metric system to gauge all dimensions in their assembly instructions, so I went out and bought a tape measure that was in mm/cm.  Made adjusting the gamma a snap and only cost a couple of bucks more - knowing that I had the rest of the antenna nailed down to length/dimension specifications.  I bought/built the Sirio V4k.


If it was me making this choice; think I would get the gamma model and build it right to specs. . .