Antennas & Feed Lines

5 free sample questions of the 23 in this topic. The full set is in the app.

1. Question 1

   What is a beam antenna?

   • A.An antenna built from square aluminum beams
   • B.An omnidirectional antenna invented by Clarence Beam
   • C.An antenna that concentrates signals in one direction
   • D.An antenna that focuses the signal into two intense rays
   Show answer & explanation

   Answer: C. An antenna that concentrates signals in one direction

   An antenna that concentrates signals in one direction. (NCVEC T9A)

   Source: 2026-2030 Technician Class FCC Element 2 Question Pool and Syllabus — Subelement T9, Group T9A, Question T9A01

2. Question 2

   Which of the following describes a type of antenna loading?

   • A.Electrically lengthening by inserting inductors in radiating elements
   • B.Inserting a resistor in the radiating portion of the antenna to make it resonant
   • C.Installing a spring in the base of a mobile vertical antenna to make it more flexible
   • D.Strengthening the radiating elements of a beam antenna to better resist wind damage
   Show answer & explanation

   Answer: A. Electrically lengthening by inserting inductors in radiating elements

   Electrically lengthening by inserting inductors in radiating elements. (NCVEC T9A)

   Source: 2026-2030 Technician Class FCC Element 2 Question Pool and Syllabus — Subelement T9, Group T9A, Question T9A02

3. Question 3

   How is the polarization of an antenna described?

   • A.By the shape of the driven element
   • B.By the orientation of the electric field
   • C.By the orientation of the magnetic field
   • D.By the direction of radiation
   Show answer & explanation

   Answer: B. By the orientation of the electric field

   By the orientation of the electric field. (NCVEC T9A)

   Source: 2026-2030 Technician Class FCC Element 2 Question Pool and Syllabus — Subelement T9, Group T9A, Question T9A03

4. Question 4

   What is a disadvantage of a handheld radio transceiver's short flexible antenna compared to a full-sized quarter- wave antenna?

   • A.It has low efficiency
   • B.It transmits only circularly polarized signals
   • C.It is more susceptible to receiver desensitization
   • D.It only works on analog signals, not digital ones
   Show answer & explanation

   Answer: A. It has low efficiency

   It has low efficiency. (NCVEC T9A)

   Source: 2026-2030 Technician Class FCC Element 2 Question Pool and Syllabus — Subelement T9, Group T9A, Question T9A04

5. Question 5

   Which of the following increases the resonant frequency of a dipole antenna?

   • A.Lengthening it
   • B.Inserting coils in series with radiating wires
   • C.Shortening it
   • D.Adding capacitive loading to the ends of the radiating wires
   Show answer & explanation

   Answer: C. Shortening it

   Shortening it. (NCVEC T9A)

   Source: 2026-2030 Technician Class FCC Element 2 Question Pool and Syllabus — Subelement T9, Group T9A, Question T9A05

18 more Antennas & Feed Lines questions are in the app, along with explanations and flashcards for every one.

OnAir is an independent study aid based on the NCVEC 2026-2030 Technician Class question pool and 47 CFR Part 97. It is not affiliated with, endorsed by, or sponsored by the FCC, NCVEC, ARRL, or any government agency.