Feedpoint impedance and radiation resistance are not the same thing. Using a folded element affects the former, but not the latter. Check out W8JI's website.
73, Dave AB7E On 10/1/2013 12:10 PM, Barry LaZar wrote:
As I read your post, I infer that at the moment you are wanting to add 160 meters to your capability. An antenna that I have used and liked is the Twin Lead Marconi. It's a simple, cheap, and effective antenna. I first saw it written up by Bill Orr years ago. The premise of the design is that a quarter wave antenna driven against ground may not be the most efficient antenna due to low radiation resistance. Therefore, raise the radiation resistance by using the theory of a folded dipole. The folded element raises the radiation resistance by a factor of 4 for 2 elements as the impedance changes as the square of the number of elements. You will still need radials, but your ground losses will decrease.
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