Aster Propagation Model Doubt

[edgar05]

Hi Engineers,


I'll be working for the first time with 3D data and the Aster Propagation Model.


I've read some comments that mention this kind of models are useless in Rural/Open Areas.


Then at which point should I prefer to use standard Propagation Models instead of Aster/Crosswave/Universal Model? or what should I consider for deciding where to use Aster Model instead of Common Propagation Models?


I appreaciate your support.


Thanks!!
Edgar