Doesn't work with digital cable

If you have digital cable (like Comcast), do not buy this product. I purchased it and could not get channels to come up at the right MHz-- I had to fine tune it manually, and then the channels would not lock in, so you would have to do this for every channel, every time you changed it. I called customer service and was told it absolutely will not work with digital cable and there is no adapter or anything that they could recommend. I'll be returning this product immediately.