One time I visited the Green Bank Radio Telescope site in W.Va and was told a story about how the operators once spent a day tracking down the source of radio i

One time I visited the Green Bank Radio Telescope site in W.Va and was told a story about how the operators once spent a day tracking down the source of radio interference which was causing noise in their data. After triangulating the signal, it was discovered that the source was a frayed and damaged electric blanket several miles away. The blanket had been used exclusively by an elderly resident's dog and had been unwittingly transmitting enough radio signals to mess up their work over at the telescopes.