Thanks Pr2.
Appreciate your quick and pin-pointed suggestion.
Fine-tuned the skew and it did the trick. (Only +0,5-1,0°!)
Skew was set according a location based table, amazing that this little change could do the trick.
Signal strength is now different: 93% on H and 87% on V-beams.
Shall I strive to have them equal?
(Right now feel that "if it aint broke don't fix it")
Just waiting for some rain and heavy clouds to check this case off!
Have a good day!