Im having exact same problem trying to connect a coaxial cable to the tv tuner. Its impossible and the few people Ive asked,( one person at Best Buy), told be he was positive all I needed was a coaxial cable. Nope. What a *******. This computer from Lenovo, version 3000 c315 has issues with their tv tuner, something very unique is required to somehow connect to the typical coaxial, my guess is some kind of extension or adapter. Very frustrating though, Ive had my computer several months now and still havent figured this out yet. ( I could have tried harder and been more persistent making phone calls and physically taking my computer to a repair shop) Ive been searching internet for the last 1-2 hours looking for solution to no avail. This is not my first attempt searching the internet for the answer either. Im bringing my computer into best buy store and have them take a look at the unique,baffling,frustrating,homosexual tv tuner. Its got issues thats for sure.