VOACAP

VOACAP (Voice of America Coverage Analysis Program)[1] is a radio propagation model that uses empirical data to predict the point-to-point path loss and coverage of a given transceiver if given as inputs: two antennas (configuration and position), solar weather, and time/date.

Written in Fortran, it was originally designed for Voice of America.

[2] Currently versions based on the original source tree exist for Windows, Linux (voacapl)[3] and OSX.

[4] The program core uses text files for I/O and a bunch of wrappers now exist.

Besides commercial visualization tools, there are also Open Source implementations with GUI: For immediate results, VOACAP provides a web interface for both the coverage[7] and the prediction.

VOACAP HF coverage prediction
VOACAP HF propagation prediction