Typically rabbit ears are good for VHF and loop for UHF. My guess is that your “rabbit ears” have the loop antenna as well (most do, or an snap on loop or butterfly). If you’re getting good signal you may not see any advantage with something marketed as “HD Antenna”… in fact most “leaf” antenna are good at UHF and sometimes VHF… so you might get less out of a leaf.
I live too far away, and use an attic antenna. I used to use a leaf… my rabbit ears weren’t good enough to get anything.