Alternate explanation: there really aren't 12 silent days. They have (in effect) a directional antenna that happens to be aimed at us on the 4 other days. When

Alternate explanation: there really aren't 12 silent days. They have (in effect) a directional antenna that happens to be aimed at us on the 4 other days. When it's not aimed at us, the signal is way below what https://www.mpifr-bonn.mpg.de/en/effelsberg https://www.mpifr-bonn.mpg.de/en/effelsberg can detect.