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The problem is when you have someone else build it for you are giving away precision for convenience. Most would not even measure out the cable that precisely or even check the velocity factor of the cable they are going to assemble for you. The best way is for you to assemble it yourself.
There has been lots of discussion about whether the lowest SWR gets you the best radiating efficiency. Also if you tune with a particular length of coax you are taking into account the capacitance the cable is adding to the antenna circuit. Change the cable to something else a different type or length and the setup has changed.

[QUOTE="Tallman, post: 540906, member: 32129"] The problem is when you have someone else build it for you are giving away precision for convenience. Most would not even measure out the cable that precisely or even check the velocity factor of the cable they are going to assemble for you. The best way is for you to assemble it yourself. There has been lots of discussion about whether the lowest SWR gets you the best radiating efficiency. Also if you tune with a particular length of coax you are taking into account the capacitance the cable is adding to the antenna circuit. Change the cable to something else a different type or length and the setup has changed. [/QUOTE]

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