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The problem of locating the sources of the harmonic distortion in power networks is still a critical task. Several methods based on multipoint measurement techniques have been recently proposed in the literature for harmonic pollution monitoring. The main goal of this study is to compare the two most powerful tools designed for this purpose and to evaluate their behavior in the presence of either balanced or unbalanced polluting loads. In this paper the results of both computer simulations on an IEEE test network and simultaneous measurements on ad-hoc experimental benchmark power system are presented to highlight the strong interaction between distortion and unbalance.