antenna transmission and reception

hi to all
i have seen so many tools to design antenna,but i havn't practiced on any tool.

my requirement is i have to transmit some data through antenna and i have to receive corresponding data at receiveing antenna.

same thing i have to repeat for multiple antenna.

can anyone suggest the tool which do this? and is it freely avaliable

Hi,

try Antenna VirtualLab:
http://www.emcos.com/index.php?id=198

As I know, you can construct there both antennas and calculate coupling between antennas.