jawod wrote:
Now, SWR dips are at 3.610, 6.710 and 13.580 MHz.

These are not what was expected. Oddly, on 40M SWR dip went further
away from the band edge (as if dipole was lengthened).
I did not change the 300 ohm window line (at 31 feet).

I'll bet your minimum SWR points are not purely resistive.
Any chance of borrowing an MFJ-259B and reporting the
purely resistive points?
--
73, Cecil, http://www.qsl.net/w5dxp