An end-fed wire on a 9:1 transformer will load up on everything — as long as it is not an unlucky length. Land on a half wave and the feedpoint goes to thousands of ohms; land on a quarter wave and it drops to nearly nothing. Both leave your tuner hunting. Pick the bands you actually use and this finds the lengths that stay clear of both, on all of them.
End-fed lengths that dodge resonance on every band you use.
An end-fed wire on a 9:1 transformer and a tuner will load up on almost everything — as long as it is not an unlucky length. Land on a half wave and the feedpoint impedance goes to thousands of ohms. Land on a quarter wave and it collapses to nearly nothing. Both leave your tuner hunting, and the first also puts high RF voltage on the transformer.
The classic published lists — 29, 35.5, 41, 58, 71 feet and so on — were chosen to dodge half waves only. They are not wrong, but they ignore the quarter-wave points, which is why some of them score worse here than lengths you will not find on any list. This tool scores against both, across every frequency in the bands you pick, and shows its working so you can disagree with it.
