Previously I used a doublet antenna for 10/20m coaxial fed..
This antenna works fine, but the biggest disadvantage was changing wire antennas between 40m and 10/20m..
So I deciced to give a Symmetrical system a try.
I have bought a second hand Vectronics HFT-1500 tuner from a fellow ham, printed some clamps and a centerpiece for a ladderline fed dipole..
Drilled 2 holes for threaded rod into my windowframe.
The max length of the dipole legs are 8.5m, and I can tune 40 and up with ease.
I can not notice any performance drop compared to my old antenna, I even think this system slightly works better.
Some pictures of the new situation: