How to Listen to Air Traffic Control: Scanner & SDR Guide 2026
Aviation radio is one of the last truly open windows into public infrastructure. While police departments encrypt more communications each year, the FAA mandates that air traffic control remain unencrypted — every clearance, weather call, and emergency is broadcast in the clear. This guide walks you through the frequencies, the equipment, and the fastest path to your first received signal.
What frequencies does ATC use?
Civilian air traffic control occupies the VHF airband: 118.000 to 136.975 MHz, spaced at 25 kHz (and in some regions 8.33 kHz) intervals. All transmissions use AM (amplitude modulation) — not FM. This single technical detail is where most beginners go wrong: a scanner or radio that only does FM will hear nothing useful on these frequencies.
Military aircraft use a parallel UHF band. The primary guard frequency is 243.0 MHz (UHF equivalent of the civilian 121.5 MHz emergency channel). Most civilian scanners don't reach UHF airband without wide-coverage hardware.
| Service | Typical Range | Mode | Notes |
|---|---|---|---|
| ATIS | 108.000–136.975 MHz (varies per airport) | AM | Recorded loop — easiest first receive target |
| Ground Control | 121.6–121.9 MHz typical | AM | Taxiway and ramp movement |
| Tower | 118.0–120.0 MHz typical | AM | Takeoffs, landings, local traffic |
| Approach / Departure | 119.0–127.0 MHz typical | AM | Arrivals and departures within ~40 miles |
| Center (ARTCC) | Varies — higher VHF | AM | En-route at cruise altitude; multiple sectors |
| UNICOM | 122.800, 122.950 MHz | AM | Pilot-to-pilot; uncontrolled airports |
| Emergency Guard | 121.500 MHz (civilian) | AM | International distress frequency |
| Military Guard | 243.000 MHz (UHF) | AM | Requires UHF-capable hardware |
What equipment can you use?
Three hardware categories cover the full range of budgets and use cases. Each has a different setup path, but all three will get you on the air within an afternoon.
Uniden BC125AT (~$99–$129)
The BC125AT covers 108–512 MHz and includes both AM and FM modes. You can store up to 500 channels with alpha tags and scan through them at 100 channels per second. Programming is straightforward from the keypad or via free PC software. Close Call RF Capture lets the radio automatically detect and hold strong nearby signals — useful when you're near an airport and don't know the exact frequencies yet.
For most beginners monitoring a local airport, this is the right starting point. It also covers VHF and UHF public safety bands, so it works for more than just airband.
- AM mode coverage: 108–512 MHz
- 500 alpha-tagged memory channels
- Close Call RF Capture for unknown frequency discovery
- PC-programmable via USB
Icom IC-R6 (~$200–$250)
The IC-R6 is the benchmark for serious airband work. It covers 0.1–1309.995 MHz and supports AM, FM, and WFM — meaning it handles airband, weather radio, shortwave, and VHF/UHF all in one compact package. Icom's analog front end has noticeably better sensitivity in the airband range than general-purpose scanners.
Scan speed is 100 channels per second with 1300 alphanumeric memory channels. The rubber duck antenna works well near airports; a half-wave vertical antenna improves reception of distant approach and center frequencies. Battery life on two AA cells is strong enough for a full day of airport spotting.
- 0.1–1309.995 MHz wideband coverage
- AM/FM/WFM modes
- 1300 alphanumeric memory channels
- VSC (Voice Squelch Control) to skip silent periods
- Compact, durable build for field use
RTL-SDR Blog V4 + SDR# software
An RTL-SDR dongle turns a PC or Raspberry Pi into a general-purpose receiver covering roughly 500 kHz to 1.75 GHz. The V4 revision adds a built-in upconverter and improved shielding over earlier versions. For airband, plug the dongle in, open SDR# (Windows) or GQRX (Linux/macOS), tune to 118–136 MHz, and switch the demodulation mode from NFM or WFM to AM.
The tradeoff is workflow: the SDR is tied to a computer and requires more software setup than a handheld scanner. The upside is flexibility — the same hardware does ADS-B decoding, shortwave, and satellite reception with different software.
- Covers ~500 kHz–1.75 GHz
- SDR# or GQRX software (free)
- Must set demodulation to AM for airband
- Can do ADS-B decoding simultaneously with a second dongle
- Works with a basic dipole or discone antenna
Finding your local ATC frequencies
Airport frequencies are publicly available through several sources. Cross-referencing two sources takes five minutes and gives you a complete picture of what's active at your nearest airport.
LiveATC.net
The fastest starting point. LiveATC streams real audio from volunteer-run receivers at airports around the world. Search by airport ICAO code (for example, KJFK, KORD, KLAX) and listen in a browser. Beyond just listening, the site lists every frequency the receiver covers, giving you an accurate local frequency list before you own any hardware.
RadioReference.com
The most complete US frequency database. Navigate to Aviation and search by state and airport name. Frequencies are community-verified and include ATIS, ground, tower, approach, departure, and UNICOM. A free account gives access to the full database; the premium tier adds scanner programming exports.
FAA Sectional Charts
Published by the FAA and available free at SkyVector.com, VFR sectional charts show airport frequencies alongside runways, airspace boundaries, and navigation aids. Tower and ATIS frequencies appear directly on the chart next to the airport symbol. Sectional charts are the authoritative source — they're updated every 56 days and reflect current frequency assignments.
Airport ATIS Lookup
Many airports publish their ATIS frequency on the airport's official page or the FAA's Airport/Facility Directory (A/FD). ATIS frequencies are stable — they rarely change — so this is a reliable one-time lookup. Once you have the ATIS frequency, the tower and ground frequencies are usually listed in the same directory entry.
Your first signals: start with ATIS
ATIS — Automatic Terminal Information Service — is the single best target for your first receive attempt. Here's why: it broadcasts continuously, 24 hours a day. There's no waiting for a transmission to happen. You tune to the frequency, and if your equipment and antenna are working, you hear audio within seconds.
Once you confirm your ATIS reception is clean, move to tower. Tower traffic is the most active channel during daytime hours at controlled airports — you'll hear every takeoff clearance, landing instruction, and go-around call. From there, approach/departure expands your range to aircraft arriving from or departing to other airports in the region.
A scanning sequence to program into a handheld scanner:
- ATIS — confirm your radio is working and AM mode is active
- Ground — hear pushbacks and taxi instructions (quieter but interesting)
- Tower — highest traffic volume, most activity
- Approach — catches inbounds from 10–40 miles out
- UNICOM (122.800) — catch pilot-to-pilot traffic at uncontrolled airports nearby
ADS-B: see the aircraft you're hearing
Audio alone gives you one half of the picture. ADS-B decoding gives you the other: real-time aircraft positions on a map, with tail numbers, altitudes, groundspeeds, and flight identifiers. The two systems complement each other — when you hear "November-Three-Seven-Four-Kilo-Lima, turn left heading 270, descend and maintain 4,000," you can see exactly which aircraft that is and watch it execute the turn.
The RTL-SDR V4 can decode ADS-B at 1090 MHz using dump1090 or its fork, dump1090-fa. If you're already using the dongle for airband audio, a second RTL-SDR (they're inexpensive) lets you run both simultaneously: one tuned to the VHF airband for audio, one locked to 1090 MHz for position data.
For a dedicated ADS-B receiver that requires no SDR setup, see our ADS-B receivers guide. FlightAware's PiAware and the RadarBox hardware are plug-and-play options that feed your data to global flight tracking networks.
Frequently asked questions
Do I need a special license to listen to ATC?
No. In the United States, passive listening to aviation communications is completely legal and requires no license. The Communications Act permits receive-only monitoring of unencrypted transmissions. Transmitting on aviation frequencies is a different matter — that requires an aircraft radio station license issued by the FCC.
Why can't I use my GMRS or ham radio to receive ATC?
Airband uses amplitude modulation (AM) on VHF frequencies between 118 and 136 MHz. Most GMRS radios and many entry-level ham handhelds only demodulate FM signals. When you tune a FM-only radio to an AM airband frequency, you may hear a distorted buzz or nothing at all. You need a receiver that explicitly supports AM mode in the VHF airband range. Wideband scanners and the Icom IC-R6 cover this. SDRs like the RTL-SDR V4 also work — but you must manually switch the software to AM mode.
What is the difference between ATIS, Ground, Tower, Approach, and Center?
ATIS (Automatic Terminal Information Service) is a looping recorded broadcast of weather, active runways, and NOTAMs. Ground control manages aircraft movement on taxiways and ramps. Tower controls takeoffs and landings within the airport's Class D airspace. Approach and Departure handle aircraft transitioning between the airport and the en-route structure, typically within 40–50 miles. Center (ARTCC — Air Route Traffic Control Center) handles aircraft at cruise altitude across large regional sectors.
Can I receive ATC with an RTL-SDR?
Yes. The RTL-SDR V4 (and earlier V3) covers 118–136 MHz with no gaps. Open SDR# (or GQRX on Linux/Mac), tune to a known ATIS or tower frequency, and switch the demodulation mode from WFM or NFM to AM. The signal should come through clearly. A simple dipole or discone antenna improves range significantly over the included stub antenna.
What is LiveATC.net?
LiveATC.net is a free web service that streams real ATC audio from hundreds of airports worldwide. Volunteers host receivers near airports and feed audio to the site. You can listen to your local tower, approach, or ground control in a browser with no hardware at all. It's the easiest way to confirm which frequencies are active at an airport before you buy equipment.
Why does ATC use AM instead of FM?
AM (amplitude modulation) has a practical advantage in aviation: when two stations transmit simultaneously, you hear a blended signal rather than a complete capture of one over the other (the FM 'capture effect'). This matters in busy airspace where a pilot stepping on a controller's call is a safety concern — with AM, both voices are audible, even if garbled. The VHF airband standard dates to the 1940s and is maintained globally for interoperability.