Maximum Usable Frequency (MUF) is the highest radio frequency that can be used for transmission between two points on Earth by reflection from the ionosphere (skywave or skip) at a specified time, independent of transmitter power.

The MUF values are obtained using a specific version of the IRI model and are corrected with data from our VIPIR ionosonde. We are not responsible for any inconvenience caused by the use of this data.