Main Page | See live article | Alphabetical index 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. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.