I had the same problem. Repairing the coax plug is difficult for an HD tv, most of the videos on YouTube are for older tvs - see link here https://www.youtube.com/watch?v=S9v-dUyzdrk . Buying an external tv tuner, sometimes referred to as a converter box, is probably the best answer (see jayeff’s answer). I bought this product https://www.amazon.com/gp/product/B07VNVXVMX/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 and it seems to work just fine for getting over-the-air tv broadcasts (not cable tv).