William,

Given that Mathcad is included, I don't think the price is unreasonable.
However, perhaps you'd consider using one of the free math manipulation
programs such as Octave in the future? It really would make it more
accessible to amateurs. Nevertheless, thank you for writing the book and
getting it published -- it definitely will help some people and is a good
addition to amateur radio literature.

At least Mathcad is much cheaper than Matlab. The MathWorks (publishers of
Matlab) has pretty much completely left out the hobbyist community... the full
version of the software is quite expensive (thousands of dollars), whereas the
"student" version (at a pretty reasonable $99, although each and every
"toolbox" is then an additional $59) require formal proof of student status,
which of course hobbyists generally don't have. :-(

---Joel