What is in your wall? Is that a cable connection that you're not using, or a connection to a rooftop or attic antenna? You need to know that before you connect this antenna to the wall and hope to use it on multiple TVs. You need to make sure that there is no other antenna or cable source active "in the wall."
I have mine going to a signal splitter which then connects to my family room TV (as it's only source) and to an old cable company cable which I intercepted and ran to the satellite box in the basement (as a replacement for their standard definition version of our local (HDTV) channels).