If you had a professional antenna installer install your antenna the connections should be OK. But, it's always useful to check each connection from antenna to splitter to each of the televisions to see if they are tight, and if the center coax extends an acceptable length to make contact. And to make sure any leftover splitters from the satellite connections are removed.
I understand that you don't know the model of the current antenna. Is it possible that you could post a good quality photo of the antenna? And maybe a second photo showing the surroundings (especially northeast)? That would help us avoid recommending something you already have or lesser than you need.
Normally I'd suggest a RCA ANt-751 pointed at about 50-60 degrees for best reception (dependent if you want the Low Power stations at 41 degrees or maybe to receive some of the stations at 205 degrees).
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