"Brian Howie" wrote in message
...
The questions I have a- Were Tonna being overcautious ? Is my modelling
software inadequate for boom effect modelling .
Hi
I think he used the same pilars on his 10cm beam that is fed from a
rectangular wave guide above the boom.
It seems he was also using them for 900Mhz yagis made for the american
market.
I can't be sure as I only have the 10 cm beam here.
It's elements are 4 cm above the boom.
One problem I remember from the 55 elements was QSB during high winds
but I am not sure if it was due to boom bending or rotor slackness.