You know that HD antenna is really nothing more than the same antenna technology of the old type. It basically, isn't that different. The connections are going to be pretty much the same, so if you need some adapter, a place like Wal-mart or K-Mart is going to provide from the electronics section what you need. You need to look and check what is needed. Of course some online sources porvide the pictures you can check on if in doubt. Google away for such pictures.
Do you know what an OLED TV is?
CNET explains how OLED technology differs from regular TVs, and what you need to know to make the right shopping decision.