Rich

A NEC4.2 analysis shows this, for the system described:

• 2.8-meter, Base-fed, Base-loaded, Vertical Monopole
• Monopole Base Elevation = 0.2 meters above the Earth
• R-F Ground = 16 Buried Radials, 3 meters in length (each)
• Radial Common Point Concentric with Vertical Axis of Monopole
• Earth Conductivity = 5 mS/m, d.c. 13 (about average)
• Applied R-F Power at Loading Coil Input = 80 mW, unmodulated

At 1650 kHz…

• Loading Coil R-F Resistance at System Resonance = 20 Ω (assumed)
• Groundwave Field Intensity at 1 mile = 84 µV/m

At 570 kHz…

• Loading Coil R-F Resistance at System Resonance = 30 Ω (assumed)
• Groundwave Field Intensity at 1 mile = 34 µV/m

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(First posted to the forums in a thread topic that would make it hard to find again.)