If I am understanding right, you are looking for the next product up from the EyeTV Hybrid you mentioned. The EyeTV 250 Plus, for example, has S-Video and Composite input, along with the coax cable port. This would let you run a cable from your TV to your MacBook and see whatever in on your TV on your computer monitor.
There are several similar products on eBay, most older ElGato products have this ability.
Also, some miniDV camcorders have component in ports, that you can use to view anything with a component out on your monitor, using the camcorder like the EyeTV product.
This all requires that you have a video out on your TV though, or you have a cable box and split the signal to the TV and to the computer.