Televisions are divided into 3 ages:
VERY OLD: only get Analog NTSC signals, NO digital capability at all.
Medium old: Get Analog NTSC AND.. QAM Digital (most cable systems) may have multiple cable scemes in their programming)
MODERN, these are normally Wide screen (16x9 I think is the ratio) and these should be capable of seeing both Analog NTSC and Digital ATSC as well as MOST cable schemes.
Some Cable Schemes require a set top box from the cable company.. No options with those.. NOTE: They may be able to provide one for you.
Recommendation: Upgrade to a new Wide Screen ATSC compatible.
I just did my last Upgrade,, The only Analog only I still have is one I keep in the basement, in a tool box, which if I ever re-up for Sat TV, I'll use it for aiming since a small portable TV and the software in the Sat Receiver is better than most in-line meters, Dish software... Well a meter as good will set you back a kilo-buck... USED.
My last upgrade was a 28" Dynex that replaced the Toshiba CRT job I had in the front of the motor home 102 dollars courtesy of a pawn shop.. Fits perfectly (Same width) Did cut the box down a bit height wise.. Long term I'll put in a door and shelves.