During the WW SSB preparation tower works I observed an interesting noise from the elements. After a closer look it turned out that due to (even low speed) the wind the 20m antenna elements start to resonate and move like a sinus wave. More interestingly this happens only to the reflector and 2nd director.
I’m sure this is not healthy on long term and this might cause damage to the elements. It’s needed to find a way to de-tune the REF and D2 to avoid this resonance.