I recently got a tuner card as well and I had bought a couple different brands of coax cables, real cheap GE Target coax cable and some fancier Radio Shack. I tried using the Target brand first and I had a bunch of static and interference so I tried the Radio Shack coax and cleared it right up. Make sure you don't have wires crossing over each other and check your connection if you are using a splitter, also make sure your splitter isn't a cheap one.