Yagi-logper is a program to model a Yagi or Log-periodic antennas with with horizontal cylindrical dipoles. All the dipoles and feeding sources need to be symmetric with respect to vertical plane. Diameter of should be small in comparison to wavelength and other dimensions in the antenna. These restrictions allow more efficient and precise solution of the problem. Short theoretical description of the method here. Orignal Fortran routines were written by Jorgen Hald at DTU. Then I rewrote the code in Pascal at TUKE and then in C++ at MSU as a part of my Intro to FEA course.