To obtain high direction‐finding (DF) accuracy in electronic warfare applications, it is necessary to maximise the number of effective data points with a small angle‐of‐arrival error. Thus, a method to obtain the DF ambiguity probability for the selected set of array spacing is required. In this Letter, a novel method to obtain DF ambiguity probabilities for four‐ and five‐element arrays by using gamma distributions is presented. The DF ambiguity probability obtained by the proposed method for the five‐element array was in good agreement with the results of simulations. For the four‐element array, the proposed method produced data that showed approximate agreement with the results of simulations. Thus, the proposed method should be useful for future applications.