The Ladder antenna is composed with linear elements over conductor plate. First, the ladder antenna with two steps of square loop and rectangular loop which have the loop length of one wave length are analyzed by the moment method, and the calculated results of radiation pattern is reported. Next, multi step ladder antenna composed with multi loops is considered. Moreover, we consider parallel multi step ladder antenna connected with two of multi step ladder antennas and present the calculated results. In results a good radiation pattern is obtained.