Ground Truth: Demystifying Radials and Counterpoises

In Radials and Counterpoises, Steve Nichols, G0KYA, delivers a highly practical examination of ground systems for vertical antennas. Heavily referencing the empirical research of Rudy Severns, N6LF, the presentation demystifies the mechanics of ground radials and suspended counterpoises.

Because the earth acts as a lossy dielectric, ground-dependent verticals suffer severe RF absorption. Nichols explains that a robust radial field replaces the antenna's "missing half," mitigating soil losses and maximizing radiated power. Crucially, the presentation dismantles pervasive amateur myths. Nichols demonstrates that surface radials need not be a quarter-wavelength; deploying many short wires (a minimum of 16 to 32) is superior to laying fewer long ones. He also clarifies the SWR paradox: while a poor ground might yield a perfect 1:1 match, adding radials improves true radiation efficiency despite raising the SWR closer to 1.4:1. Finally, Nichols defines counterpoises as elevated wire networks substituting for earth connections, highlighting limited-space solutions like the Folded Counterpoise (FCP) for 160 meters.

This presentation is an essential, pragmatic guide for amateurs seeking to optimize vertical antenna performance without wasting real estate, wire, or transmitter power. It provides the actionable engineering data required to build a highly efficient station on any lot size.