Areps Free -

: The system accounts for complex factors like terrain elevation (using DTED data), air temperature, and humidity.

While the software itself is a government-developed tool, you can find free educational posts and documentation regarding its capabilities and access below. Key Resources and Posts Areps Free

: A highly useful post/paper for understanding the system's "guts" is AREPS and TEMPER – Getting Familiar with these Powerful Propagation Software Tools. It compares AREPS with other models and explains its use of the "Parabolic Equation" method for calculating wave propagation. : The system accounts for complex factors like