A:AnswerNo, just connect it to WiFi or LAN and download the apps from the Samsung app store. The TV+ app it comes with is pretty good too. I can get cable channels that I cannot even get from my local cable company.
A:AnswerMy generic HD antenna picks up 22 local channels, but this TV comes with Samsung's "TV Plus" included for free. With an internet connection, TV Plus has roughly 160 channels, and that is just for the TV Plus app. There are many many apps that allow additional options. If you want to get local news, you may desire an antenna, but chances are that your internet connection will provide more stations than you need.
A:AnswerI have a FHD 15" laptop with this TV connected by HDMI as a secondary monitor. Windows 10 allows me to use this TV as a secondary monitor or to mirror my laptop's screen. In the secondary monitor role, I have the TV is set to "3840x2160 (Recommended)" resolution, but I could also go up and pick 4096x2160. Better graphics cards may allow even better or higher resolutions, but I don't know.