The design of antenna systems requires the setting up of accurate mathematical models which enable the complex electrodynamic processes occurring in the conductors to be adequately described. The use of such models considerably reduces the amount of expensive experimental research that needs to be done and simultaneously extends the amount of useful information on the behavior of antenna systems under different operating conditions. In this paper we present an algorithm and a program for analyzing the electrodynamic characteristics of rectangular phased antenna arrays consisting of arbitrary wire radiators.