Abstract
Long range VHF transequatorial propagation experiments between Athens (Greece) and Roma (Lesotho) on 34, 40 and 45.1 MHz, in progress since 1967, have an equinoctial character regarding occurrence and strength. Studies of fading characteristics and topside electron density profiles lead to the conclusions that phase coherent signals are most likely at least 2-hop great circle F-transmissions, while other afternoon and evening types, including flutter signal, which is strongly related to equatorial spread- F, are off great circle supermodes involving two reflections from the F-layer without intermediate ground reflection.
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