On Wed, 23 Mar 2005 10:40:48 -0600, Tom Ring
wrote:

I have a coworker that would like to put up a 40m antenna on his tower
that has some gain and directivity. I have modeled a few things, and
while they are fairly satisfactory, I wanted to see what ideas the group
had.

The approximate limitations are as follows -

o Boomlength 30 feet
o Element length 30 feet
o Any vertical components are max -10 feet from the plane of the boom
and elements. The reason here is that it's a crankup, and his roof
clearance would be about 10 feet when lowered.

It would be desirable to have both CW and phone covered, but phone only
is ok.
It will need to be coax fed.

Thanks.

tom
K0TAR


Have you looked into the Moxon or X Beam designs? There is also a
drooping yagi where the elements of the yagi are fixed length, but a
wire is hung on the ends of the elements to keep the lengths of the
driven and reflector elements properly resonant. Additionally, you
can try linear loaded elements for the beam.

If it is small and directional, you better choose a portion of the
band and focus on that. I don't think you will find too many wide
band shortened beams.


--
73 for now
Buck
N4PGW