Bill Turner wrote:

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

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

Maybe beam efficiency? (cone beam power)/(total radiated power)
--
73, Cecil http://www.w5dxp.com