Hello everyone. My rate goes up to 3500 or so and most channels are ok but my major channels (abc, cbs, nbc) are poor, poor, poor. Actually one doesn't come in and says "no or weak signal". Any ideas? It doesn't make sense to my non-technical mind. Almost forgot, I'm on comcast cable with no cable box (use cable card) and a direct cable line to slingbox.

Thanks for your help.