jimbo wrote:
Thanks for all of the advice. I have one more question. Can I tune a
J-Pole antenna in my shop and then move it to the attic and expect the
same performance? In other words, is an antenna an antenna or is an
antenna and it's installation an antenna?

You can tune a J-Pole antenna at one place in free space, move it
to another place in free space, and expect the same results. The
real world is not so forgiving. The conditions will not be
identical but they may (or may not) be close enough to be
acceptable to you. Welcome to the real world of ham radio.
--
73, Cecil http://www.qsl.net/w5dxp