I have an EARCHI EFHW (40:1 unun)antenna that I used quite successfully until it fell from a tree.  I wasn't able to get it back up, so ran it along my wooden fence temporarily.  Unfortunately, the wire was shorter than the original (~60 ft), and I had trouble getting it to match with a less than 3:1 SWR on several bands.

Somehow, I ended up adding a couple of shorter (about 10ft) lengths of wire to the antenna terminal of the match box.  NOW the thing matches on 80-6 meters, with SWR of less than 3:1!  And with a decent signal (I get out to South America for example). Note these are not like radials for a vertical which are connected to ground, these are connected to the center or positive terminal of the coax. Is this a sort of off center fed fan dipole? Whatever it is it works surprisingly well...especially on 80m! 

![Diagram[1]][1]


I have added the NanoVNA charts.  Today I also raised the lower end of the antenna up to about 7 feet above ground.  Note, these are WITH the wires.  I'll disconnect the wires and do plots later.
[![3.5MHz to 29Mhz][2]][2]
[![1.8 to 10Mhz][3]][3]


  [1]: https://i.sstatic.net/MEuHe.png
  [2]: https://i.sstatic.net/Uuwu9.png
  [3]: https://i.sstatic.net/aJz2W.png