Abstract
Since 1974, several experiments have been conducted at Eureka, Canada (80° N, 86° W), to investigate the properties of lowangle fading. For a variety of site diversity configurations, it was found that neither a horizontal spacing of 500 m nor a vertical spacing of 20 m provided good diversity performance. For a vertical spacing of 180 m, however, fading at the two sites was essentially uncorrelated. Lowangle fading was more prevalent and severe in the summer and absent when the atmosphere was wellmixed or during radiative temperature inversions. A model of the refractive index structure of the atmosphere has been developed which predicts these characteristics and shows that deep fades need not result from interference fading.
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