When it comes to shortened HF antennas, coil diameter can make a big difference. A larger coil can provide greater inductance per turn, allow wider spacing between turns, reduce some losses, and potentially improve power handling. In this video, I compare a 2-inch diameter coil to a much smaller 5/8-inch coil to see why bigger coils can offer advantages—and when a smaller, more compact coil might still be the better choice for your antenna.
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