and was wondering if I would get more stations if I replaced the old aerial with a Digital Aerial.
You can't, as there IS NO SUCH THING as a digital aerial.
For digital read wide band, calling it digital makes sense as with the change over you needed a wide band aerial rather than narrow band used for the analogue signal. There are many examples of incorrect words used, I remember reading an early TV licence and it said apparatus to receive broadcast TV signals when referring to is colour licence is required. That when I was a boy was the aerial but I am sure if I paint the aerial black and white I can't get away with a black and white licence. Wording has changed now, maybe some one pointed out the error. I see advertised freeview TV but it's not free you have to buy a licence.
I will agree it is annoying when some one calls a box of electronic components designed to give a regulated output of 12 volt likely in the Mhz range an electronic transformer, it's a switched mode power supply but that is what many call it, same with an electronic ballast it's a high frequency fluorescent lamp controller it does not contain a ballast, the list goes on, what is the difference between a quad and a car? A quad is a car, I had a Reliant 3 wheeler not a Reliant trike.
I write a message using text there is no such word as texted. Same as worst, worster and worstest the last two don't exist. And as to very last, well it is simply last no need to say very.
Yes should be called wide and narrow band but today wide band = digital which is a pity as in many places you no longer need a wide band aerial to get digital stations. As to if the same colour coded narrow band aerial as used with analogue is still the one required for digital I don't know, it is where I live but seem to have read in the South Wales they have had problems squeezing them all in.
Since some of the band has been sold off I expect there is now a new name for aerials which receive only the new band width. What is that going to be called? New Age Digital?