On 2006-07-09, Bob D. wrote:
I haven't used a Smith Chart in over 30 years, and to say the least, I'm a
bit rusty. I'm thinking there must be computer programs that can do the
calculations with values you just plugs in. Any recommendations? I'm
specifically interested in finding the impedances of antenna whips much
shorter than 1/4 wave.

For real operating systems (anything Unix based -- Linux OSX or a real Unix)
try Linsmith http://jcoppens.com/soft/linsmith/index.en.php