If it's a flat screen, it's most likely digital ready. If it has a coaxial connector on the back, all you need is some coax and a digital antenna mounted on a short pole that is held stable enough so that it doesn't fall, but loose enough so that you can turn it to point the antenna towards station antennas. Of course this assumes there are stations with 75 miles or so. Otherwise, you're going to need a larger antenna and taller pole.
You can buy omindirectional antennas at Walmart at places like that that will work for stations that are much closer, but they will never match the performance of an outdoor, directional antenna.
You can find good antennas on the Web for around $50 bucks or so, plus shipping. Link
Now a little feedback on picking up digital TV signals. You'll find that there isn't such a thing as "snow" that you probably remember getting back in the days of analog TV. When a digital TV signal gets weak, you get what's called "pixelation" as the TV set's receiver doesn't receive all the zeros and ones that are needed to color each dot on the screen. When this happens, it just fills an entire block of dots with a single color that it can detect from the signal. And if the signal gets even weaker, it will just freeze with whatever information it received last.
The good news is that so long as the signal is strong enough, you're going to get a perfect picture without any snow or those dreaded horizontal lines that old timers like me can remember back in the day.