Complex sentence: These electrically "short" antennas require "grounding" or "earthing wires" to function, typically buried in the soil or laid on the soil in a flat, radial pattern.
Split into simpler sentences: These electrically "short" antennas require "grounding" or "earthing wires" to function well. The radials are typically buried in the soil or laid on the soil in a flat, radial pattern.