EZNEC knows sh*t about propagation. EZNEC and other antenna modeling
software can calculate the radiation pattern of modeled (not real) antenna
according to given ground parameters and antenna geometry. It gives you idea
how the pattern looks, but not the where the signal goes after entering
propagation media.

However, in collaboration with a propagation prediction program, it
gives you helpfull insights about influence of the pattern on the
propagation and about the take-off angle most likely needed for point
to point contacts on a given day, time and/or frequency. If you don't
mind a little studying, you could try MultiNec, NecWin+ or 4nec2 with
the VOACAP predication software. About EZnec I am not quite sure. To
include terrain influence in all this, you could take a look at HFTA.

Arie.