1 Erratum to: Telecommun Syst DOI 10.1007/s11235-017-0287-2

The following sentence in section 2.5 of the article needs to be revised.

OLD TEXT:

“Walden [49] reports that several propagation prediction models neglect the effect of the extraordinary wave.”

NEW TEXT:

“Walden [49] reports that several propagation prediction models account for the extraordinary wave in MUF predictions.”