MUF helps hams decide which frequencies are best for long distance communications. The folks at Prolab provide this continuously updated shot of both MUF and the vaunted “Grey Line”. As the Gray Line, or Terminator as it’s sometimes called, pass over an area, skywave propagation is likely to be at it’s best. Check back here anytime for the latest and greatest graphical depiction of MUF.
A current look at the Maximum Usable Frequency – via spacew.com. Updated continuously.