You know and I have said publicly many times that I really admire your EFHW design, and it is the antenna I use the most. The purpose of my analysis shown above was to evaluate by how much weaker my signals will be when I have to use my various loaded SOTA verticals under typical constraints. A typical constraint for me and likely many other activators is to use a mast of 6m or less, be they carbon-fiber or glass-fiber. The 10m masts I know and own (e.g. the one from SOTAbeams, which is equivalent to the DX-Wire mast) is way too long and too heavy for my activations. So yes, any full-size dipole, be it your design with traps, a linked dipole, or a single-band dipole, will hang too low for 40m.
But I do not think that renders my analysis useless or highly subjective, IMO.
The EFHW was tuned to resonance; the SWR check was just to make sure it had not been detuned. I actually think the 1.3x measurement was for the vertical and the EFHW was close to 1:1; my notes were not very readable wrt this.
Of course, the duration of the experiment was too short for a solid scientific evaluation. But it gives a good hint that indeed a short loaded vertical with a single tuned and elevated radial can radiate pretty well, which is also in line with what Gerd Janzen, DF6SJ, documented in his book.
Please also note that the single radial in my experiment was shortened and brought to resonance with the help of a 6 uH toroid-based loading coil, so both the radiator and the radial where close to 1/8 lambda.
Again, many thanks for your great EFHW design.
73 de Martin, DK3IT