On 9/19/2013 8:31 AM, beamar wrote:
When Six is open, you don't need much. But, the gain of a yagi will get you
through a pile up. When I went from a three element yagi to a five element, I
did better working into the Caribbean, Central and South America because the
longer yagi would attenuate all the domestic signals off the back of the
antennna
Going from a 3 to a 5 element yagi shouldn't provide *that* much
additional f/b ratio. Checking on various manufacturers I find a typical
difference in f/b from 1 to 4db. For example, the M2 3 element yagi has
a spec'ed f/b ratio of 20db and their 5 element yagis are 21db. Only
when you get to a long yagi (7 elements or more) do you get to 23db+ f/b
ratio.
Other manufacturers often specify about a 4db difference going from a 3
or 4 element to a 5 element yagi.
--
Jack, W6NF/VE4
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