G4E06:What is one disadvantage of using a shortened mobile antenna as opposed to a full-size antenna?
Direct answer summary (2023-2027 NCVEC pool)
The official correct answer for G4E06 is Operating bandwidth may be very limited.
The key fact is Operating bandwidth may be very limited. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.