Just to make it clear, there is no such thing as a "digital" antenna except in advertising
A VHF antenna from 50 years ago would still work fine to receive digital VHF signals
Same for a UHF antenna, it will work fine to pick up digital UHF signals
Digital channels use an ANALOG carrier signal, which is why the old antennas work just fine, each carrier can have 1 or more HD digital signal packets embedded, "channel 2" is a carrier(VHF), and "channel 32"(UHF) as well
You do need a Digital Tuner hooked up to an antenna to tune in/pull out the digital packets(1's and 0's)
Any TV sold after 2005 was required by Law to have a Digital tuner built in
But you can also get stand alone digital tuners
TV Fool:
https://www.tvfool.com/
Is a website that can show you what free digital channels are available in your location, and what antenna sizes may be needed, also HAT(height above terrain) which is important for your antenna height
Most TV Transmitters are up high on mountains or buildings
If you are in or near a bigger city there will be many channels available, not just Networks
Indoor antennas can also work if transmitters are close enough and not blocked by buildings, but they are for UHF channels, 14-36, 38-83
VHF requires a larger antenna
And in most cases ABC, NBC, CBS, FOX and PBS are required to have a FREE local digital broadcasts to maintain their licences
So you can get local news and weather for free and use streaming for entertainment
Your existing coax cable in the house can be used to distribute Antenna signals, depending on how many outlets you need you can get an amplifier, usually 1 to 3 outlets are OK without amplification, but depends on the type of coax cable and length of each run to the TV location
Again not a "digital" thing any TV signal amplifier that does both VHF and UHF will work, you are amplifying the Carrier signal, channels 2 thru 83, the packets inside can not be amplified
VHF antennas can go in attic spaces, most roofing material is RF(radio frequency) transparent, UHF antennas are better outside or near a window if inside