If your local DTV channels are all in the UHF band (and they probably are), you will be able to use a small(er) UHF antenna to receive the signals.
If you have an existing antenna and it is getting good reception of all the local UHF stations over the air, you will probably also get good reception of the DTV signals.
Go to www.titantv.com
and see what is being broadcast in DTV and what the channel numbers are. If they are all 14 and higher, then they are all UHF.