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Passive radar is briefly discussed before the concept of HF passive bistatic radar is introduced using a sky-wave illumination path and surface-wave reception path. The HF passive radar under construction at UCL is described briefly. The signal processing required to reveal targets is presented followed by a comparison of analogue and digital illuminators of opportunity and their potential to detect targets. Finally the signal to interference ratio for the HF specific case is presented and conclusions are drawn on the need for interference cancellation.