ORIGINAL MESSAGE:

On 2 Dec 2006 05:36:05 -0800, "Denny" wrote:


For those who wish to actually learn and not just insult each other,
get a calculator, learn how to calculate Cosine Theta a trivial math
problem that any 9th grader can be taught in 5 minutes flat, get a BIG
piece of paper reason to come, and actually calculate the shape and
vector length of the lobes of a two element Yagi-Uda antenna... Do the
calculation in both the horizonal and vertical planes... From that you
can calculate the volume of each lobe, which is proportional to the
percentage of power in each lobe... From that number you can very
simply calculate what percentage went into the lobes you prefer and
what went in the lobes you don't prefer...
snip

------------ REPLY FOLLOWS ------------

The problem here is not math, it's English. You are calculating gain
and/or directivity, not efficiency.

Bill, W6WRT