09-30-2010, 04:35 AM
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Join Date: Apr 2005
Location: Nova Scotia,Canada
That site in the original post is the only one I have seen that states 9% shortening. Everything else I have ever seen or heard states about 5% which is what I believe to be true unless you are using a really fat conductor on VHF/UHF
frequencies. The reason is partly due to the velocity factor of the element material and mostley due to something called "antenna end effect" which is a small capacitance that is formed by the antenna elements in air and has the effect of "detuning" the antenna. In order to compensate the antenna length must be changed slightly.
Knowledge is knowing that a tomato is a fruit, but Wisdom is knowing not to put it in a fruit salad.