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I am working on an end fed (faux half wave) antenna for 75 meters (3.9 MHz is my target frequency).

I currently have one of these - http://myantennas.com/wp/product/efhw-8010 which is basically a 7:1 unun - that I want to use for a single band antenna.


I have successfully used ~130 feet of wire with the unun in the past, but now want to use it within a space the only allows for ~60 feet.

I basically want to use the 7:1 unun attached to a 60 foot coil loaded wire that will represent 1/2 wave on 75m (120 feet).


If I go to http://www.k7mem.com/Electronic_Notebook/antennas/shortant.html I can get various figures for the lengths, coils and spacing, but I have a qaundry. Should I use the figures generated by entering 3.9 MHz and 60 feet, select value A (overall length of a half wave dipole), which is B+C x 2 and use 2 coils, or should I use 1.95 MHz and 120 feet and just use B=C and a single coil?


Any thoughts on the above or any other suggestions with regard to making a ~60 foot wire look electrically like ~120 feet?