This is called the radio quiet region . Some people believe that an extraterrestrial civilization might choose this region to broadcast a message, especially if they are a life form based on water like us. They might choose to broadcast in this region, hoping that we would be thinking along similar lines. An alien message would also most likely be what we call a narrowband signal . This means a signal at a very precise frequency.
Radio stations are examples of narrowband signals.
Between radio stations you hear a hissing sound. This is broadband noise . An intelligent, communicating civilization would probably use a narrowband signal rather than a broadband one for a beacon, since they wouldn't want their message to be mistaken for regular, ordinary star noise. The chances that an extraterrestrial civilization would actually come to the Earth are slim. The amount of time and energy required for the travel would be enormous.