Try it without the amplifier.

Alternatively, do what I did: bend a large paper clip into a loop, plug it into the jack, and see what channels you get after a scan. You might be surprised what a paper clip can pick up.

I think most tvs have them at this point. Once connected, you should find a prompt for the TV to scan for available stations. You will probably have to browse to the setup/settings area for this. The scan can take a few minutes. And if you are within 20 miles of a reasonable metro area, you will get dozens of channels. Most of the them junk, but you can delete the ones you don't want from the scan. Might check the owners manual on your tv. If you don't have it, just google the TV model and it's owner's manual or quick start guide. Shouldn't be too hard to find.