We cut the cord about seven years ago. Couple of things to help with the transition and getting live sports:
1. There's no such thing as a 'Digital' or 'HD' antenna. EVERY television antenna made since the UHF era is capable of receiving Digital HD signals over the air (OTA) signals. The only thing that has to be digital is your receiver. If your television was made in the past, say, 10 years, it should already have this built in. Only older (generally tube) TVs are going to need an extra apparatus. Whole point of that is
focus on strength and directional capabilities, NOT that it's labeled 'Digital HD'. Others here have put out the best sites for determining what you need.
2. As far as football, you are only going to get the local network and syndicated games with an antenna only. This would be ND on NBC, SEC on CBS, B10/B12/Pac12 on Fox (1-2 games on Saturday), some combination of games on ABC (generally big nonconference matchups or "brand name" rivalry games), and whatever syndicated packages are available in your area (ACC network, etc.) To get WatchESPN, you'll need something like Amazon Fire TV, Roku, Xbox 360/One, Apple TV, or, if you're somewhat tech savvy, you can connect your computer directly to your television. To see the devices that come with a WatchESPN app, see:
http://espn.go.com/watchespn/apps
3. When you're searching for devices that stream WatchESPN, keep in mind that "SEC Digital Network" is NOT the same as "SEC Network" or "SEC ESPN Network". The SEC Digital Network is a collection of clips, interviews, replays, etc., not live streaming of full games.
4.
Your biggest (or most expensive) hurdle is going to be getting access to WatchESPN. It used to come packaged with your internet service (as ESPN3 or ESPN360), but they reorganized this a few years ago so that you only get select out of market games with the ESPN3 package, but most of what you want is going to be through WatchESPN, which is dependent on your cable or satellite provider (which you're trying to ditch). So... if you're lucky enough to have a family member or close friend that has dish or cable and they are willing to give you their username and password, you can use that to access WatchESPN on one of the devices I listed above. There are two catches here. Ths first is that their dish/cable provider has to be a WatchESPN partner (see list in dropdown here
https://espn.go.com/watchespn/activate). The second is that your access will be based on the ESPN channels they have in their package, so if they only have ESPN (and not, for example, SECN or ESPN2 or ESPNU), then you'll only get ESPN programming. If this option is available to you, it can also work on other channels as well.
5. If the friend or family member's password option is not available to you, the only non-pirated way I know without a dish/cable subscription is SlingTV. The basic+sports package is $25/month. The thing to keep in mind here is that you're going to have to review the devices that are supported, which are different than WatchESPN by itself (
https://www.sling.com/devices).
6. If you do hook your computer directly to your television, the temptation is always there to go to sites like FirstRowSports or any number of Scandinavian-based streaming sites. If you do this, make sure your Anti-virus software is up to date and functioning.
7. If you can make WatchESPN happen, that will take care of most of the Mississippi State games. There will be some that you just won't get though, like games that appear on ESPN Game Plan (usually low-level OOC games) and certain 'away' games (TV rights are generally based on the home team). This will be a bigger deal for the Big 5 OOC home and homes we have in the future.
8. ESPN has the only really viable streaming product. Outside of their mobile apps, the rest of pretty hit and miss, so don't expect to get any games from the following channels: Fox Sports (1 or regional channel), CBS Sports Channel, or NBC Sports (formerly Versus). BYUtv actually has a few apps and they stream the BYU sports that ESPN isn't airing.
9. As far as other services, I'll run through them. Hulu is free. Hulu Plus is not ($8/mo). By default, Hulu is only available on your computer (you can buy special software, but that's a headache I'll address later). Anything that has a Hulu app requires you to fork over the $8/mo for Plus. The movie selection is nothing special, but you get TV Shows up to the night before. Netflix is worth the money, especially if you have kids, but Amazon has been buying up the rights to a lot of TV shows, so it's not the slam dunk it used to be. If you see a movie or TV show you want to watch, go ahead and plan to watch it because it may not be there in a few weeks. If you have Amazon Prime, you can use the Amazon app if it's available on your device. They offer HBO shows up to about the last year or so. Movies-wise, they're about the same as Netflix. The following services generally have apps, are free, and are not dependent on your provider: Crackle, TubiTV, Yahoo Screen. Generally, it's older TV shows and movies and some original programming
10. You don't necessarily need the highest speed for your internet unless you're going to have a lot of devices (TVs, tablets, phones, etc.) streaming at one time. Don't get the lowest speed necessarily, but you might want to start on the lower end and creep up incrementally if it doesn't work out for you. Your wireless router needs to high and centralized to the main devices that will be streaming (like your TVs). It's worth the extra money for a longer Cat6 cable to make that happen.
11. While it's running, your microwave can mess with your wifi connection.
12. Depending on how technical you are, software like PlayOn or Plex can be useful when there's no native app to get you the content you want.
http://www.playon.tv http://plex.tv
Hope that helps and good luck!