I read that only a narrow band of radio waves are reserved for astronomical observation, and humans emit all sorts of electromagnetic waves, which leads to my question:
Could there be signals of advanced life lost in the chaos of all the other EM bands *the technology we use emits? We haven't been listening for aliens as long as we've been blasting out waves, and any far off source would be very quiet, so are we potentially drowning important signals out?
Wikipedia seems to at least partly back up my question, I would like more details though!
Many radio frequencies penetrate Earth's atmosphere quite well, and this led to radio telescopes that investigate the cosmos using large radio antennas. Furthermore, human endeavors emit considerable electromagnetic radiation as a byproduct of communications such as television and radio. These signals would be easy to recognize as artificial due to their repetitive nature and narrow bandwidths. If this is typical, one way of discovering an extraterrestrial civilization might be to detect artificial radio emissions from a location outside the Solar System.