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Eddie I have been looking.

DDRR means Directional Discontinuity Ring Radiator
Or I have seen it called
Direct Driven Ring Radiator
Also called a Hulla Hoop antenna.
http://orionmicro.com/ant/ddrr/ddrr1.htm
Have a look
This is also interesting.
I have to leave but will be back later.

73
Jeff

[QUOTE="AudioShockwav, post: 678900, member: 6"] Eddie I have been looking. DDRR means [B]D[/B]irectional [B]D[/B]iscontinuity [B]R[/B]ing [B]R[/B]adiator Or I have seen it called Direct Driven Ring Radiator Also called a Hulla Hoop antenna. [URL]http://orionmicro.com/ant/ddrr/ddrr1.htm[/URL] Have a look This is also interesting. I have to leave but will be back later. 73 Jeff [/QUOTE]

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