Anomalous propagation observed by radio amateurs at frequencies of 28 to 148 Mc during displays of aurora polaris is described. This phenomenon, first correlated with aurora in 1939, is characterized by the following features:(1) A very high fading rate, such that voice modulation is rendered unintelligible(2) Directional antennas give best results when pointed north (toward the aurora)(3) Lack of skip effect(4) Little change in polarizationComparison of reports of the radio phenomenon with visual observations of aurora indicates this effect is most common with auroral displays extending below 56° geomagnetic latitude, although the lack of amateur stations at high latitudes may influence these data. Until more precise fading data are available, development of a suitable theory is deferred