> Then there was the fact that it was tumbling and wasn't emitting anything There is a range of the radio spectrum we can't really practically measure: the ver

> Then there was the fact that it was tumbling and wasn't emitting anything There is a range of the radio spectrum we can't really practically measure: the very, very low frequencies. Consider a nanohertz signal. Period of each sine wave: 31 years. You might also need an antenna the size of the solar system to grab anything.