Perhaps a more important question is not about the risks of transmitting, but the dangers in receiving. Many in the SETI community have shown commitment to the belief that a technologically advanced civilization will be altruistic, despite the lack of evidence supporting that assumption. Therefore it is assumed there are no significant risks with listening quietly.
In an interview for Business Insider, astronomer and former director of the Center for SETI Research Jill Tarter, responded to Stephen Hawking's concerns about Active SETI, or sending messages to possible extraterrestrial civilizations rather than simply waiting and listening for signals from said intelligent aliens.
A mysterious meteorite crashes into a school and many students are killed and even more are seriously injured. Five students inexplicably come out of the wreckage unscathed and gain supernatural powers while becoming outcasts at school. As they begin to search for answers, they become targets for a secret government program that tests the group's abilities for reasons unknown to them all.