Gary Schafer wrote:
Could you explain how to build one of those antennas that has infinite
impedance at its ends?

An open circuit is close enough to infinite to satisfy
almost anyone. In virtually every technical textbook,
ideal conditions are assumed until one understands the
concepts involved. Then the real world conditions are
introduced. That's all I am doing - presenting the
concepts involved in an ideal dipole as described by
Kraus and Balanis. Do secondary real world conditions
exist in reality. Of course they do and nobody is
saying that they don't. The difference between infinity
and ten megohms is often negligible for analysis purposes.
--
73, Cecil http://www.qsl.net/w5dxp