Principles of Communication: Antenna MCQ

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AntennaMediumQuestion 20326

Question

A half-wave dipole antenna transmitting at 150 MHz has a physical length of approximately:

A
2 m
B
1 m
Correct
C
0.5 m
D
4 m

Correct answer

1 m

Explanation

λ = c/f = 3×10⁸ / 1.5×10⁸ = 2 m. Half-wave dipole length = λ/2 = 1 m. At 150 MHz (VHF), a 1 m dipole is physically practical. This is why VHF/UHF antennas are manageable in size while AM radio towers must be tens of metres tall.

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