If the frequency is the same, the antenna used will have the same optimal design. Very true. I have no idea if the new TV frequencies are the same, but UHF and VHF do require different designs for best reception, so I hope it’s not still both.
Correct .. it still comes down to VHF / UHF. During the conversion the bulk of the stations affected were probably on a VHF channel and started digital broadcasts on UHF at reduced power. I had to install a better UHF antenna to receive the broadcasts. Once the conversion was complete some stations switched back to a VHF frequency, some stayed on UHF.