This is the design I used for both of my two End Fed Antennas.
Instead of the FT 140-43, I used a FT 240-43 for much more power, not needed but beter safe than sorry
Very easy to build design and a good antenna for people who don't have much space for big towers or long wires
The heart of the multiband (you could as well call it “anyband”) end-fed is a 1:49 (to 1:60) impedance transformer that feeds half a wave of wire fed at the end (or beginning) where impedance is (very) high (around 3k Ohms). You could consider the end-fed an half wave “off center fed” dipole that’s fed VERY off center, like a Windom taken to the extreme: total length half a wave divided over one very long leg and one very short leg. The short leg is so short, that we actually leave it out. Just like a windom, it doesn’t require any radials. BUT ! it will use the screen of your coax cable. So make sure there is at least 10 meter coax and where the coax enters the shack install a common mode filter.
