Oregonian Haruspex wrote:
On 2014-10-11 16:27:04 +0000, gareth said:

Relying on someone's NEC program to number crunch to
produce the answer 42 is not the same as understanding
what is going on as an aid to didactification of novices.

And having the formulas in front of you aren't much help when they
can't account for the local ground, or nearby objects.

How much control do you have over the local ground or nearby objects?

How much control do you have over the design of an antenna you are
designing?

The only way to figure it out is to do it. The math is only helpful
for spherical cows in a vacuum.

On the contrary, first you analyze the antenna, then add nearby objects
to the model and adjust the ground conditions to your real ones.

I assume you have made measurements of your local ground or have at
least looked at the various maps that are available?



--
Jim Pennino