Antonio - I think you slipped a decimal point. The parallel equivalent of the
series combo 58R-2947j is actually 149k+2948j.

Hi John,

I do not understand where your -2947j figure comes from. I see it appearing
nowhere in my calculations.

The antenna mentioned by Mikek has an impedance of 58R-1,072j which, according
to my spreadsheet, corresponds (at 1 MHz) to the parallel of 19862R and -1075j
(that is a 148,1 pF capacitor).

In any case, parallel -- series trasformations never result in a change of the
reactance sign; therefore it is not possible that a -2957j (negative) reactance
is transformed into a +2948j (positive) reactance.

73

Tony I0JX