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Communication between two or more participants is obtained through a non ideal transmission medium. Such medium is usually characterised by different types of distortions which affect transmitted signal. Many of them are not completely avoidable. In order to minimize their effect at the receiver end, adequate performance measure of distortion-to-signal influence is needed. As the one of the most reliable measures for evaluating total distortion on transmitted signal, from transmitter to receiver end, we consider a bit error rate. In this paper, we propose a low-cost bit error rate measuring system constructed as RTL-SDR based wireless Hardware-In-The-Loop system. The proposed measuring system is tested in indoor environments on BPSK modulated signals. Obtained results show high matching with theoretical expectations. Also, for the proposed system adequate graphical user interface is created in the Matlab.