Various methods and systems directed to electromagnetic signal proximity detection are disclosed. For example, an EM detector may include an antenna array for sensing electromagnetic radiation produced by a source of radio-frequency electromagnetic radiation, one or more amplitude demodulation circuits coupled to the antenna array configured to perform an amplitude demodulation of one or more signals provided by the antenna array to produce one or more respective demodulated output signals, and an analysis circuit coupled to the amplitude demodulation circuit configured to determine at least one relative characteristic between the antenna array and the source of radio-frequency electromagnetic radiation. The relative characteristic may be the relative distance and/or angle between the antenna array and the source of radio-frequency electromagnetic radiation. The embodiments allow for signal source detection and location determination without knowledge of the frequency of a target emitter.