Hourly forecast

What frequency should I use

Using the most appropriate HF radio frequency is crucial when establishing contact with STORADIO. The HF Propagation Forecast will help you choose the most appropriate HF frequency given: the time of day/night, the atmospheric conditions and geographic location, by showing the most suitable HF frequency for communication with us. Choose the chart diagram that is closest to your geographical location. General rules: The higher the sun, the higher the frequency. The lower the sun, the lower the frequency. The longer the distance, the higher the frequency. The shorter the distance the lower the frequency.

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Get forecasts


The Long term propagation charts are valid for three months.


The Daily Area Predictions (DAP) of communication frequencies for the present day are based on SWS average maps of the ionosphere.

The Hourly Area Predictions are based on near real time hourly ionospheric map.


or on the ground for forecast and much more.

Get in touch

The offices of Stockholmradio are in beautiful Nacka Strand, slightly east of Stockholm, a 10-minute drive away from the city center.

Don’t be a stranger, contact us! We are here 247!

Phone: +46 (0)8 601 79 00
Address: P.O Box 1242, 131 28 Nacka Strand, Sweden

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