"Art Unwin" wrote in message
...
Hold on. I don.t know if I have a pencil beam as I can't measure it or
model it.
However, I don't see that as a real hurdle! The idea that the beam
width changes with frequency is beyond my ken. As for a final tweaked
design, for a ham that is an impossibility

but you do have one that is built to your spec right? and you can turn it
by hand? so if you point it at a local AM station can you see a big
increase in signal strength and a good front-back and front-side ratio?? I
don't need a 'final'design, as you say that is impossible for a ham, but
i'll settle for something better than a 4-square for 160m that i can turn
with a normal rotor!