On Tue, 1 Sep 2009 00:23:31 +0200, "-.-. --.-" wrote:

Like the precedent post on underground antennas systems, i'm just curious
and happy if someone *demostrate* me that a strange antenna have a
incredible efficiency.

Hi OM,

Demonstrate is not possible. The antenna radiation is not correctly
described.

Consider: a commercial AM quarterwave, vertical antenna is probably
95% to 99% efficient. To have an incredible efficiency would add only
4% more to a very simple design that has been around for 100 years.

+0.2dB or less is not incredible efficiency.

You cannot hear 0.2dB difference in sound, you cannot measure 0.2dB RF
difference except with great difficulty.

73's
Richard Clark, KB7QHC