Aliens are real. I believe. Have they visited earth? I don't believe so. Space is so vast, and life is so varied I don't believe that they've visited us. I think the probability that were the most successful organisms in the known universe is low, but I ultimately think the great filter is the intelligent life forms themselves.
Perhaps maybe before humans even existed. I agree though, I think the signal idea is good on paper but just not effective enough. The answer should be atmospheric composition data, mineral data, and then ultra high resolution imaging (better than JWST which I know isn't yet possible) and then a message so we're not randomly blasting radio signals.