I've always agreed with Stephen Hawking on the subject of intentionally sending radio signals into space in order to contact aliens or let them know we're here..
"The discovery of intelligent life elsewhere in the Universe would be the biggest scientific discovery ever. But it would be very risky to attempt to communicate with an alien civilization. If aliens decided to visit us then the outcome might be similar to when Europeans arrived in the Americas. That did not turn out well for the Native Americans."
Attempting to communicate with them has been a moot point for decades. The earth has been in "broadcast" mode since the 1940s, what with all of our radio and television broadcasts and all.