DUAL DDRR C0-Phased Citizens Band HF Antenna Array

In layman’s terms a DDRR is just a short vertical monopole (vertical post) attached to a transmission line tuned by a reactance (ring plus vacuum capacitor). The reactance of the capacitor is transformed by the transmission line and will under specific conditions (length, value of the capacitor, etc.) make the vertical post resonant. Slight variations of the capacitor will lengthen or make the transmission line “shorter” and allow tuning of the antenna on a certain range.

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SLIM JIM 11m ANTENNA PROJECT Several designs rolled into one Edited and condensed from various designs http://www.hamuniverse.com/slimjim.html Page with other bands information and videos HERE The Slim Jim Antenna The Slim Jim is a vertically polarized omnidirectional end-fed antenna having considerable “gain” and this is concentrated almost parallel to ground toward the horizon rather than skyward… Read more »

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The DDRR looks like a piece of rubbish and it is, it just does not perform like it looks. It performs EXCELLENTLY!! DDRR means Directional Discontinuity Ring Radiator

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