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Bigbear,
Your TV Fool map is blank. Go to that link and enter your address, then click "Map This". Then copy that URL and paste it here.
To answer your question, look up at it from the ground with binoculars or a camera with a zoom. If it looks normal, and there are no elements missing, and it's still pointed in the right direction, it might be OK.
My first suspicion would be the connections, and then your pre-amp and splitter. I'd inspect the cable and connections (every inch) from the antenna to each television, and even run a new cable direct from the antenna through a window or door to one television as a test. [Your description is not clear whether you added the cable 25 years ago or recently.]
What antenna are you using (if you can't tell can you post a picture)?
When the antenna worked correctly, what channels did you get?
When did the channels stop coming in?
What channels do you get now?
When you adjusted the direction did you use a magnetic compass?
It sounds like there are several things you can check before you begin a discussion about a replacement antenna.
Jake
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