Nick wrote:

[stuff]

Here is a link to get you started:

http://www.aa5tb.com/efha.html

This deals with a 1/2 wave monopole. I have found that 1/2 or 5/8 is
where it is at (antenna radiation pattern), and usually end up
physically shortening the 1/2 wave ant with a loading coil or helically
winding it over the entire shortened length of ant (fiberglass tube,
etc., in the 10 meter band about 8 ft.)

Regards,
JS