wrote:
On Mon, 07 Feb 2005 16:54:15 -0700, Wes Stewart
wrote:


I'll admit that I've not followed this thread and don't intend to
punch any tar babies. But I must ask; what the hell is a "180
degree"
front lobe?

What he wants is a cartoid pattern, That is a "D" shaped roughly
pattern that's all from and not so much back.


Indeed. Basically like what i showed you:

http://www.drslick.org/Temp1/yagiplot.jpg


This "D" shape is suitable for when the broadcaster
wants some directivity, but will NOT be on the
extreme edge of the service area or town. It's
obviously not suitable if you are in the center
of town, unless you wish to focus more ERP
in the direction of some taller buildings,
for example.



The easy way to do that is a good colinear and mount it near
the flat face of a tower (usually less than 1/4 wave away) . The net
effect is slightly increased gain away from the tower and a mild null
on the other side of the tower. Most of the time this is not
desired
but, there are valid cases where you don't wish to waste power behind
you. The most common is coastal commercial broadcat radio and TV.


Do you have a specific design on hand?


Slick