📡
Frequency
108 MHz
Frequency
108 MHz
🧭
Range
108–118 MHz
Range
108–118 MHz
🧩
Band Group
VHF (30–300 MHz)
Band Group
VHF (30–300 MHz)
🌐 Summary
The 108 MHz allocation is part of the VHF (30–300 MHz) spectrum. This range is used worldwide for critical applications that keep our communications and infrastructure running smoothly. On this page we highlight how each band is applied in real systems, from regulatory assignments to everyday devices. Our goal is to make spectrum data clear and practical for engineers, regulators, and enthusiasts alike.
Key uses of this band include: 108 MHz: Air traffic comms; FM radios, car radios.
Aeronautical radionavigation: ILS localizer & VOR (108–112 MHz).
🔍 Explore the full RF Spectrum database
📡 Band & Geometry key
| Field | Value |
|---|---|
| Wavelength (m) | 2.778 |
| Waveforms | – |
| Antenna Form Factor (Typical) | ¼-wave ≈ 69.4 cm |
| Band Family | Aeronautical |
| Band | Aeronautical radionavigation (VOR/ILS) |
| Primary Common Name | Aeronautical radionavigation (VOR/ILS) |
| FSPL @ 1 km [dB] | 73.108475109739 |
| FSPL @ 10 km [dB] | 93.108475109739 |
| Fresnel Radius @ 1 km (m) | 26.351540822193 |
| Band Group | VHF (30–300 MHz) |
| Tax Band Family | VHF |
| Tax Band Class | VHF Airband |
🧩 Applications & Usage
| Field | Value |
|---|---|
| Primary Application | – |
| Lower Neighbor Use | Broadcasting (FM) |
| Upper Neighbor Use | Aeronautical mobile (R) (civil airband) |
| Typical Services Devices | Air traffic comms |
| Market Common Devices | FM radios, car radios |
| Refarming Use | No |
| Device Ecosystem Size | Medium |
| Device Hotspots (MHz) | 100 |
| Device Category | FM Broadcast Receivers |
| Typical Use Cases | – |
| Modulation (Device) | Broadcast FM (Receiver) |
| Channel Width (Device) [kHz] | N/A (Receiver) |
| Device Region Profiles | Global FM broadcast |
| Per-Region EIRP Or Duty (Device) | Receiver-only (EIRP N/A) |
| Allocation Relevance (Device) | High (broadcast) |
| Adjacent-Band Collision Risks (Device) | Low: broadcast spacing rules apply |
| Example Devices Or Skus | FM Radio Receiver |
| Common Protocols | VHF AM Voice (8.33 kHz); VDL Mode 2 (select freqs) |
🗒️ Notes
| Field | Value |
|---|---|
| Receiver Selectivity Notes | – |
| Interference Notes | Critical safety communications |
| Compatibility Risk Notes | Aviation-critical service nearby/in-band; In sensitive band: Aeronautical VHF (Airband); Sensitive service in adjacent block |
| Notes | Aeronautical radionavigation: ILS localizer & VOR (108–112 MHz). |
| Propagation Notes | Strong coverage, good indoor penetration |
⚙️ Technical Rules
| Field | Value |
|---|---|
| Lower Band Frequency Limit | 108 |
| Upper Band Frequency Limit | 118 |
| EIRP Indoor Limits | Prohibited (ILS/VOR) |
| EIRP Outdoor Limits | Prohibited (ILS/VOR) |
| PSD Limit | – |
| Emission Mask Class | Aeronautical NAV (protected) |
| Guardband Minimum [kHz] | 833 |
| Typical Bandwidths | ~150 kHz occupied |
| Autocalculated Bandlimits | No |
| Typical Bandwidths (Estimated) | ~150 kHz occupied |
| Max EIRP [dBm] | Receiver-only (EIRP N/A) |
| Power Source Or Duty Profile (Typical) | – |
| Channelization Plan | – |
| Channelization | – |
| Guard Band Requirement | – |
| OOB Emission Limit [dBm/MHz] | Ultra‑strict |
| Spurious Emission Limit (dBm) | Ultra‑low |
| RX Blocking Min [dBm] | -15 (planning) |
| Duplexing | Half-duplex |
| Duplexing Information | Half-duplex: narrowband / push-to-talk |
| Uplink Pairing | – |
| Downlink Pairing | – |
| Paired Band Info | – |
| Max EIRP [dBm] | – |
| Channelization Block Size | 200 kHz FM channels |
| 3GPP Band Number | |
| Example 3GPP Bands | – |
| LTE Uplink Bands | – |
| LTE Downlink Bands | – |
| NR Uplink Bands | – |
| NR Downlink Bands | – |
| Guard Bands | ±100 kHz spacing |
| Protocol Or Standard | – |
🌎 Country Overrides
| Field | Value |
|---|---|
| Tax Service Category | Other / Various |
| Tax License Type | Safety-of-Life |
| Tax Regions | Global / Varies |
| ITU Region 1 | Aeronautical radionavigation |
| ITU Region 2 | Aeronautical radionavigation |
| ITU Region 3 | Aeronautical radionavigation |
| License Type | Aeronautical service (licensed, safety-of-life protected) |
| Primary Application | – |
| Primary Services | – |
| Spurious Emission [dBm] | Ultra‑low |
| Lower Neighbor Use | Broadcasting (FM) |
| Upper Neighbor Use | Aeronautical mobile (R) (civil airband) |
| Licensing Model | Licensed (Aviation) |
| Typical Services Devices | Air traffic comms |
| US FCC Alloc | FM Broadcasting (47 CFR Part 73)– |
| CA IC Alloc | FM Broadcasting (BETS/BPR)– |
| UK Ofcom Alloc | FM Sound Broadcasting (87.5–108 MHz)– |
| US Ref | 47 CFR Part 73 (FM) |
| Typical Bandwidths | ~150 kHz occupied |
| Market Licensing Model | Licensed (Broadcasting) |
| Market Common Devices | FM radios, car radios |
| Fresnel Radius (1st, 1 km) [m] | 26.351540822193 |
| Typical Bandwidths (Estimated) | ~150 kHz occupied |
| Auction Status | – |
| Refarming Use | No |
| Typical Site Spacing km | – / – |
| Device Ecosystem Size | Medium |
| Traffic Load Share | Coverage-heavy, low capacity share |
| Device Hotspots (MHz) | 100 |
| Device Category | FM Broadcast Receivers |
| Typical Use Cases | – |
| Typical Center Frequencies [MHz] | – |
| Rule Part (Fcc Or Region) | – |
| Modulation (Device) | Broadcast FM (Receiver) |
| Channel Width (Device) [kHz] | N/A (Receiver) |
| Device Region Profiles | Global FM broadcast |
| Per-Region EIRP Or Duty (Device) | Receiver-only (EIRP N/A) |
| Allocation Relevance (Device) | High (broadcast) |
| Adjacent-Band Collision Risks (Device) | Low: broadcast spacing rules apply |
| Example Devices Or Skus | FM Radio Receiver |
| Antenna Form Factor (Typical) | ¼-wave ≈ 69.4 cm |
| Power Source Or Duty Profile (Typical) | – |
🛡️ Regulatory & Neighbors
| Field | Value |
|---|---|
| Lower Band Frequency Limit | 108 |
| Upper Band Frequency Limit | 118 |
| Rx Blocking Min dBm | -15 (planning) |
| Lower Neighbor Use | Broadcasting (FM) |
| Upper Neighbor Use | Aeronautical mobile (R) (civil airband) |
| Lower Neighbor Band | Broadcasting (FM) |
| Lower Neighbor Range | 89.000–107.000 MHz |
| Upper Neighbor Label | Aeronautical mobile (R) (civil airband) |
| Upper Neighbor Range | 119.000–136.000 MHz |
| Adjacent-Band Collision Risks (Device) | Low: broadcast spacing rules apply |
| Real-World Range (Indoor/Outdoor) | – |
| US FCC Alloc | FM Broadcasting (47 CFR Part 73)FM Broadcasting (47 CFR Part 73) |
| CA IC Alloc | FM Broadcasting (BETS/BPR)FM Broadcasting (BETS/BPR) |
| UK Ofcom Alloc | FM Sound Broadcasting (87.5–108 MHz)FM Sound Broadcasting (87.5–108 MHz) |
| Regulatory References | US: 47 CFR Part 73 (FM); CA: ISED BPR‑3 (FM Broadcasting); UK: UK FAT + Ofcom Broadcasting Code |
| Global Harmonization | Regional |
| Crossborder Coordination | High |
| Sharing Mechanism | – |
| Auction Status | – |
| Guard Or Pair | – |
📈 Market & Measurements
| Field | Value |
|---|---|
| Noise Floor | -105 dBm (est.) |
| Interference Cases | – |
| Lower Neighbor Range | 89.000–107.000 MHz |
| Upper Neighbor Range | 119.000–136.000 MHz |
| Interference Notes | Critical safety communications |
| Market Licensing Model | Licensed (Broadcasting) |
| Market Commercial Value | Medium (legacy broadcast) |
| Market Common Devices | FM radios, car radios |
| Market Deployment Density | Dense urban, nationwide |
| Noise Floor (Estimated) | -105 dBm (est.) |
| Market Commercial Value (Estimated) | Medium (legacy broadcast) |
| Ecosystem Maturity | Emerging |
| Indoor Penetration | Good |
| Known Interference | No major interference issues noted |
| Device Ecosystem Size | Medium |
| Real-World Range (Indoor/Outdoor) | – |
| Antenna Form Factor (Typical) | ¼-wave ≈ 69.4 cm |
| Ecosystem Maturity | Emerging |
| Device Ecosystem Size | Medium |
| Chipset Availability | Limited / TBD |
| Operator Deployments | Limited operators |
| Technology Generations Deployed | Multiple / TBD |
| Roaming Support | – |
| Traffic Load Share | Coverage-heavy, low capacity share |
| Indoor Penetration | Good |
| Known Interference | No major interference issues noted |
| Occupancy | Medium |
| Occupancy Bucket Pct | 10–30% |
| Latency Profile | – |
| Common Channels Or Profiles | – |
| Security Features | – |
| Lbt Or Fhss Requirement | – |
| Popularity (Installed Base) | – |
| Coexistence Tips | – |
| Latency Class | – |
| Device Hotspots (Scoped && Tagged) | – |
