W6ELProp

W6ELProp predicts ionospheric (sky-wave) propagation between any two locations on the earth on frequencies between 3 and 30 MHz.

There is no charge for W6ELProp when used for non-commercial purposes.
Minimum system requirements:
Windows® 95, 98, ME, XP, 2000, or NT
2 MB Ram
2 MB disk space