Listening to HF Air Traffic

The HF bands still provide some interesting listening, even with all the modern technology it still provides a low cost backup.

Air traffic will of course use VHF within a couple of hundred miles of land, but that means on transatlantic flights the vast majority is outside of VHF coverage. HF is by no means the primary means of communication, but it is still used and does provide a low cost method to communicate beyond Line of Sight (LOS)

Air traffic is controlled by zone, below you can see the regions involved.

North Atlantic Control zones

Shanwick Radio provides a long-range voice communications service for Oceanic Air Traffic Control in the eastern half of the North Atlantic. Shanwick Radio keeps in contact with all flights in Oceanic Airspace mainly by means of High-Frequency Radio (HF), but also uses VHF Radio and Satellite Phone (SATPHONE).

HF can provide a wide range of coverage depending on the frequency and time of day/night. VHF coverage, on the other hand, is limited to LOS range typically around 200 to 300 miles. Shanwick Radio uses over 20 HF and 2 VHF frequency channels.

127.9MHz124.175MHz
VHF Shannon ATC

Shannon (Ireland) ATC also provides a VOLMET service, broadcasting 24 hrs a day on a number of frequencies. You can use these stations to check the propagation of the HF bands.

Shannon VOLMET 3413 kHz

Gander (Canada) also provide VOLMET services, and this can be ideal for checking propagation to the USA. It’s worth remembering these stations are well-sited with 5 to 10 kW of RF power.

You can listen to the VOLMET service on your own HF receiver or online SDR

HF is also used on air sea rescues, on the following frequencies, the air sea rescue helicopters use the callsign format Rescue xxx.

2182kHz3023kHz5680kHz
Search and Rescue

The Shannon (Ireland) and Gander (Canada) HF frequencies are listed below, not all frequencies will be active at the same time. Traffic will depend on HF propagation, and frequencies will vary by time of day.

Shannon ATC

I have a KIWI SDR online, although my urban location is a bit noisy!

Did you know you can submit a reception report online and receive a QSL card!

You can download a CSV file with the frequencies here to load into your scanner.

Family “A”3016kHz5598kHz8906kHz13306kHz
Family “B”2899kHz  5616kHz8864kHz13291kHz
Family “C”2872kHz5649kHz 8879kHz11336kHz
Family “D”2971Khz4675KHz8891kHz13291kHz
Family “F”3476kHz6622kHz8831kHz13291kHz
Family “H”3491kHz6667kHz10021kHz
Family “I”2890kHz6595kHz
Family “J”3446kHz6547kHz
HF North Atlantic Air Traffic Control

This map (Credit ICAO.int) gives you some regional context to the frequency plan.


The transmitter sites (receivers sites often separate) are well located, you can view then in Google Maps

Gander Radio (Canada)

Shannon Radio (Ireland)

You can track aircraft around the UK in real-time using just a Raspberry PI and dongle.

You may also be interested in HF ACARS, another HF communication method to track and message aircraft.

Further reading

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