get my tv directly connected to the internet

Hello, I have the fastest internet speed offered.  I do not have cable services, but I am streaming Netflix, Hulu, etc. and my TV keeps getting stuck.  It's very hard to watch a show because it keeps stopping.  All of my other devices in the home work fine.  The TV is downstairs while the wifi router is upstairs.  However, I see there is a coaxial connection near my TV that must have been previously used for cable TV.  I don't want cable TV, but can that be used to connect my TV directly to the internet?  Would it require another router downstairs?  Note that I've tried everything else, including wifi extender.  I just really want it directly connected.  How is this possible?  Thanks!  It is very hard to consult tech support because they appeared to understand the problem and then set me up with an appointment to pick up a new TV box...I do NOT have TV services.  I tried multiple times, but nobody seems to be able to understand my question or offer assistance.  They DO want to try to sell much stuff though.