I still had a clothesline with metal core cut in four pieces tuned for 10 and
20 meters laying ready to put in the attic, to replace the UTP network wire.
New dipole antenna from clothesline, tuned for 10 and 20 meter bands
This evening I found some time to replace the wires and test the results.
In the 10 and 20 meter PSK31 frequencies the SWR is now good (if I remember
correctly from the antenna analyzer it's around 1:1.2), the SWR meter on
the radio doesn't leave the corner anymore. This also means the voice
frequencies on 20 meter are now available for me!