Chtistofire wrote:
"I`d be willing to bet, say, 100 UK pounds that Professor Unwin can`t
create an antenna in hardware that radiates isotropically, that is over
the whole sphere within let`s say +/- 1 dB with respect to any chosen
(but constant) polarisation."

Many would bet just as Christofire.

An isotropic may fit Art`s definition of "equilibrium" but according to
Terman it is impossible. Terman`s footnite on page 871 of hid 1955 opus
says:

"An isotropic antenna produces waves that are of equal strength in all
directions. Although an isotropic radiator of coherent waves does not
exist because it cannot satisfy Maxwell`s equations, the properties of
such an imaginary antenna are easily visualized, and the concept of an
isotropic radiator is often found useful to the analysis of antenna
systems."

My money is on professor Terman.

Best regards, Richard Harrison, KB5WZI