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Good question.

 

These models are over real Earth, so I use a mast. Reason is the mast has some effects that probably should be considered for how an antenna might respond. With the mast included the model also shows how the mast currents tend to affect the pattern over real Earth.

 

Personally, I prefer free space models and in most of those cases I remove the mast.

 

How do you see the use of the mast in the model?