A:AnswerHi Jim.
There are no more analog over-the-air signals since 2016. If you are using an antenna with this TV you are already using digital 100%.
Charles V. - Insignia Support
https://www.insigniaproducts.com/contact-us
A:AnswerHi, Butchie.
Thank you for sharing your inquiry with us. This TV can only be hooked up to antennas with regular coaxial cords.
Alexander G. - Insignia Support
A:AnswerThe TV has a usb type A input. If your PC tower has a usb type B output you can probably connect it with a standard usb cable. Most PC's have usb type A inputs. I would suggest an HDMI cable to use the TV as a monitor, that way you get audio as well as a good picture.Does your tower have a HDMI out? Some older PC's have a DisplayPort connector that will connect to an HDMI adapter. Good luck...
A:AnswerHi! Yes, this TV and all of our other TV models have a tuner built in. If you have any other question, please contact us and we will try our best to assist you. Viri E. Insignia Support. https://www.insigniaproducts.com/contact-us