Radio spectrum knowledge: Which frequency band contains commercial FM broadcast radio transmissions?

Introduction / Context:
FM broadcasting uses a specific portion of the radio spectrum defined internationally, though exact allocations vary by region. Knowing the correct band helps in understanding propagation characteristics, antenna design, and interference considerations for broadcast and communications systems.

Given Data / Assumptions:

• FM means frequency-modulated broadcast radio for the general public.
• We are identifying the parent band, not the narrow sub-band allocation.
• Standard ITU band names and ranges are assumed.

Concept / Approach:

Commercial FM broadcast typically occupies 88 MHz to 108 MHz, which lies entirely within the Very High Frequency (VHF) band of 30 MHz to 300 MHz. VHF propagation characteristics suit local to regional coverage with line-of-sight tendencies and moderate antenna sizes.

Step-by-Step Solution:

Verification / Alternative check:

Radio reference material and regulator tables (for example, ITU, FCC) list FM broadcast as part of the VHF band, cementing the classification.

Why Other Options Are Wrong:

• VLF and LF: Far below FM frequencies; used for navigation and specialized communications.
• HF: 3–30 MHz; used for shortwave and skywave propagation, not FM broadcast.
• None of the above: Incorrect because VHF is correct.

Common Pitfalls:

Confusing HF (shortwave) with FM due to historical radio terminology. Remember that FM broadcast sits well above HF in the VHF band.

Final Answer:

Very High Frequency (30 MHz to 300 MHz)