Sporadic E propagation
Sporadic E propagation is a rare form of propagation where a
radio wave bounces off a sporadic E cloud in the E layer of the
ionosphere. Distances of 750-1500 miles are common. It affects
TV channels 2-6 and all FM channels, starting at Channel 2, and working its way up to the FM band after Channel 6. Very rarely, it may hit Channel 7.