Amateur Extra Class: 2020–2024
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E9A10:

Which of the following improves the efficiency of a ground-mounted quarter-wave vertical antenna?

  1. Installing a radial system
  2. Isolating the coax shield from ground
  3. Shortening the radiating element
  4. All these choices are correct
E9A01 E9A02 E9A03 E9A04 E9A05 E9A06 E9A07 E9A08 E9A09 E9A10 E9A11 E9A12 E9A13