But to get the most signals I'd have to mount a Digital signal TV antenna versus just using the current older style antenna they have on the roof.
If the older style on the roof is the directional, multi-element antenna (a yagi), it will work just fine as long as it also has a UHF element. The only difference between it and a "digital" yagi is that it has elements you do not need (VHF-Low), and being the longest elements on the antenna they add size and wind load. The digital yagi elminates those longer elements, but is otherwise the same type of antenna, nothing special about its being "digital".
I use this
Winegard HD7694P antenna. It is only rated for 45 miles by Winegard and AntennaWeb, but since I have a true line of sight to the PHX transmitters 68 miles distant, I pick up all of the PHX stations perfectly, with no amplification. Winegard also makes yagis for longer distances, but line of sight plays an important role. Prior to getting that, I had an older style (larger) antenna that was working fine with digital broadcasts, but its size made it heavier and more subject to the sometimes high winds we have here.
A TV signal is a TV signal, analog or digital, which is why the older style antennas work just fine (if oriented correctly). I have been using that Winegard for 14 years now, since the switchover to digital broadcasting.