Many or most tuners are found to lack optimum inductance to tune 160m.
As others posted, add some feedline, or some of the other tricks to move
the impedance seen at the tuner to a less extreme value.
Adding or subtracting feedline may move a high voltage condition to ease
a match. At 160m, it would be a very long ground wire that causes you a
problem. Consider what a quarter wave is at that band.
That said, do be aware of avoiding quarter waves in the length of the
ground wire on any band, or odd multiples of a quarter wave.
I think your main problem is the antenna length at 160m, forcing a bad
impedance matching situation at the feedpoint.
-Stuart Rohre
K5KVH
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