Topband: Amidon W2FMI UnUn Transformer question

[Bryon PAUL Veal n0ah]

On an Amidon  W2FMI UnUn Transformer, what would be the closest description of the impedance mismatch of 50 ohm coax to the feedpoint of a vertical obtaining the lowest SWR using B-F ports?  I recently redid the MA160M Vertical feed point and found the natural SWR, since removing the nearby30-160M  sloper, that the minimum SWR without the UnUn went from 3.2:1 up to to 5.3:1.  Now I am really convinced I have a great radial field considering without it hooked up, I’m 1:...... This combination gets it to 1.6:1 match with 15KHz of usable 3:1 bandwidth- Does anyone have the matching chart for the Amidon W2FMI UnUn Transformer? 

73  Paul  N0AH