John Smith wrote:
In my travels about the net, I chanced upon this antenna--a rather
unique one and is a good conversation piece ...

http://www.orionmicro.com/ant/ddrr/ddrr1.htm

Regards,
JS

I've seen the same antenna called a "Directional Discontinuity Ring
Radiator" (a rose by any other name). Lots of Google hits for that phrase.
73,
Bryan WA7PRC