Wireless Cable Transmitting

I am wondering if any of you use some sort of system of transmitt cable wirelessly. I want to be able to watch/record shows from the cable-->my computer.

I did a quick search on google and it looks like most of the solutions are quite expensive.

Anyone have any experience with this sort of thing? If it matters, I have a digital cable box.

Thanks in advance.

It's not wireless, but I record using a TV card on my PC.. then I play it on my TV using my Mac Mini, which plays the videos I have saved to my PC.