You may use Matlab to simulate any thing you want Also I think there is a program called ADS it is useful for simulating High frequency circuits you may find anntenas simulation inside it (I am not sure)
Yes, you right. There is a simulation tool called ADS but I don't think it will simulate
a communication transmission environment (with antennas and taking into account the propogation path loss of this link; friis relation etc.)
Matlab is a bit difficult for me because its a unviersal tool and I wish to find more specific EDA for it.