The SETI project has been looking for signals from nearby stars that exhibit some non-random content that could be, for example, TV transmissions. The reruns of "I love Lgrzbyliy", "I dream of Jaxcryghie", "Grysbypwn's Island", and "Leave it to Bzaqqrytir" collected to date are apparently hilarious enough that they are keeping them to themselves so far.
Many modern radio transmission methods are purposely designed to appear as random noise. Unless a receiver knew the random sequence patterns in use they'd never know there was any intelligence to them.