I have a vacation rental with Comcast digital cable. I have a cable box in the living room where I get full access. In 2 bedrooms, I have older TVs (10-15 years old) plugged directly into the cable coming out of the wall. I get a handful of channels, mostly networks up to about channel 15. I don't really want to rent boxes for the bedrooms since I'm not there often. I see that there are lots of Comcast cable boxes on sale at eBay for about $30. Can I just buy one of those to see the additional channels? I'm not looking for a descrambler or hack, I just want to see all the channels without paying 2 additional box rental fees. Is this possible? Thanks.

Don't waste your money!!