For the base price, you get on-demand stuff from almost all of the networks (but not The CW) and even get them live in some markets. There are lots of basic cable stations (minus Viacom-owned stations like SyFy and Comedy Central). Each new tier of service adds more channels, going up to $44.99 to add some sports programming, and $54.99 for 90 channels, ending with $74.99—that Ultra package has those 90 channels plus paid cable services HBO and Showtime (but no Starz) for a little less than adding them separately.
That six-or-nine bucks a month gets you access to some of the most popular shows on TV the day after airing, including The Big Bang Theory, Mom, Elementary, Survivor, Amazing Race, even daytime shows. There are also a few thousand old TV shows streaming here, such as Cheers, all the versions of Star Trek (the rights are owned by the CBS Corporation), Brady Bunch, The Twilight Zone, and Hawaii Five-0. You can insert your own joke here about how the Tiffany Network is for your grandparents, because I already made mine above.
The most famous of the cheap HDMI brands, Monoprice has dozens of options to chose from. The linked cable is "Premium Certified," which is actually a certification. It basically means the cable is more or less guaranteed to work with 4K and HDR. The Premium Certified logo isn't required for 4K HDR, but if you see a cable that's Premium Certified and has the matching hologram and QR code, it's a pretty safe bet it will work. 
I put a couple of units to the test and found that the new breed of antennas really work as advertised. In an environment like New York City with numerous obstacles to transmission towers, a major selling point of cable TV in the analog era was that it was the only reliable way to get a clear signal from the free network channels. But today, on a lower floor of my Brooklyn brownstone, I can get 60 OTA channels with a small tabletop antenna like the $50 Mohu Curve, which has a 30-mile antenna range. It did take a bit of trial and error to find the spot in the room with the strongest signal for most stations, but I got the best results by placing it near a window.
Recently, I tried out (and returned) so many that I worked my way down to this one. It was far from my first choice. When I got it, my hopes weren't high. I generally prefer plain black headsets. Having the large "sharkbite" components on the back of the earbuds seemed unnecessary and ostentatious. I'm not a fan of how the earbud tips are forced ... full review
One note of caution: if you do decide to cancel your cable subscription, there is no perfect method to cut the cord and no magic configuration that will give you all the access that you’re used to with cable at a deep discount. You will likely have to subscribe to a patchwork of different services to get all the channels and shows you want to watch. And even then you might have to forgo watching certain shows live and decide to sacrifice access to channels you’re used to having.

We also recommend testing your internet speed at peak streaming hours (between 6 – 10 p.m. weekdays) to determine if your neighborhood struggles under the strain of heavy traffic. For instance, if you routinely get around 10Mbps downloads during the day, but that figure takes a dive to about 3Mbps around dinner time, you’ll want to call your internet provider to see if anything can be done. Fortunately, this is an increasingly rare problem outside of rural areas, but better to check ahead.