The paper presents the study of limitations of different techniques used for direction of arrival (DOA) estimation of uncorrelated and correlated wideband signals. The study was restricting the inter-sensor spacing of the array antenna to minimal wavelength of the applied wideband signal to avoid spatial ambiguity. The effect of the bandwidth on the estimation accuracy of wideband DOA is described for the case of two incident signals. First we analyzed two uncorrelated signals using MUSIC method. Second we suppose that the two signals are coherent using ML method. The study demonstrated that tradeoff between the signal bandwidth and DOA resolution of wideband signal. The paper suggests suggests reducing the array antenna elements as a solution for this tradeoff.