Take a sheet of rubber (say 3-5mm thick) maybe 150mm long and the
circumference of the element wide. Make 3 equally spaced cuts 70% of the
distance of the long dimension. It will now look like a 4 fingered hand
shape!

Using a hose clamp tie this rubber sheet around the uncut end around the
elements at some convenient place. The idea being to damp mech
oscillation. Maybe 1/3 the way down each element but I haven't exactly
thought about where the best place would be.

It may slightly detune the antenna but I haven't thought that through
either!

Cheers Bob VK2YQA


wrote:

Hello all,
I build one year ago an 8 element 50 MHz yagi. Boom is made with 50 mm
square aluminum tubing with