Another thing, an old antenna from the 50's and 60's era will work, as well picking up digital signals; Like the Radio Shack's Channel Master antenna. Just connect the antenna to your digital tv, set your selector switch (cable/air) to 'air' or 'antenna' and simply scan for channels.
Of course, if you have cable internet, you may not need to put up an outside antenna, simply get a 2-way splitter and connect the cable to the input in, then output the other two cables, one to your router and the other to your digital TV, but this time set your (cable/air) selector switch to' cable' and scan for channels, You WILL NOT get any basic cable stations, just broadcast stations which is free, to the public anyway, so it is not illegal.Try it to see if it works.
Another way is getting a Roku unit*, then search for the major 'broadcast' networks, you probably won't be able to watch your programs, on the day they run; But the next day, you can still watch your favorite show On Demand.
On the Pluto station on Roku, you can watch the old Mission Impossible series, or even Hawaii 5-0 There is even Tubi and similar sites that is like Netflix with commercials. Plus loads of free movies if you're willing to sit through the commercials. The Roku unit even has YouTube, which is free, and if you have Netflix a paid service, that is on there as well; As well as other paid services, It's your choice. :) (end)
*NOTE; If you have both tv cable and cable internet and want to cancel your cable, the company may increase your internet payment, in this case, it is cheaper to keep both.If you can afford both then you can use your antenna and/or Roku as back-up.
