G9D07:Which of the following describes a log-periodic antenna?
Direct answer summary (2023-2027 NCVEC pool)
The official correct answer for G9D07 is Element length and spacing vary logarithmically along the boom.
The key fact is Element length and spacing vary logarithmically along the boom. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.