"Dave (from the UK)" writes:

There is a scanned copy of a book you may find interesting:

----
Antennas, John D. Kraus, Ph.D.., 1950, 553 pages

This book is a college text and engineering reference on antennas. A
pretty thorough theoretical treatment along with practical information
on antenna design.
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See

http://www.pmillett.com/Books/Kraus_antennas.pdf (7.9 MB)

More books at

http://www.pmillett.com/technical_books_online.htm

Apparently the copyright has expired on these books, so they are not
pirated. I actually own a copy of the Kraus book, but it is attractive
to have a copy on my laptop.

I don't know the rules for when copyright expires in different
countries. But I do know that John Kraus died in July 2004. I have the
3rd edition of his "Antennas", it is from 2001. The front matter says
"Copyright 1950, don't remember, 2001"

So I am not sure that the 1950 edition is in the public domain.

Kraus was a very interesting character. Invented ham antennas in the
thirties, the helix antenna ca. 1945, central in the development of
radio astronomy, and finally one of the driving forces behind SETI at
home.

Of course, it is much easier to keep up with the times if you shape
them yourself :-)

73
Jon