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Hi David,

Thanks, that's one possibility, or simply model it.
But I have no idea how high the max. impedance is the ATU-10?can still handle.

For example, a 4.2m tall vertical would show on 10m an R (real part) of about 420 Ohm and jX (complex part) of 680 Ohm, resulting in an SWR of about 30.?

I found a post for the ATU-100 (/g/ATU100/message/1485) that shows that ATU-100 basically can deal with high SWR better on higher bands and I assume this also applies to the ATU-10. Does the ATU-100 has a wider impedance range in comparison to the ATU-10?

73 Stephan