I would like to know please whether or not we have sent radio signals to exoplanets that may be habitable.
Thanks in advance !
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Short answer : Yes
Long answer : Yes
We have actually sent radio signals to distant exoplanets that are thought to be capable of hosting (hopefully intelligent) life.
The second link only 'mentions' a planet that had been sent radio planet :
Those waves, which are all electromagnetic like light, would have since traveled about 70 light years away from Earth. The newly confirmed Kepler 452b, at 1,400 light years away, will not be seeing 'I Love Lucy' for more than a millennium.
Hope this answers your question.