Solved Mysteries - The KLEE-TV Reception Hoax

Most people probably never would have heard of Houston's short-lived first television station were it not for a widespread story of its signal mysteriously being received in England, three years after it had ceased operations (call letters changed to KPRC-TV).

The hoax took years to unravel and not until after it had appeared in the pages of Reader's Digest and become widely known. Even today, long after it has been debunked, the story continues to raise its head from time to time.

Snopes has a full explanation.