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I don't know a lot about those, but can you add a splitter AFTER the cable box and run one wire to each tv?
I'm not sure if this is exactly the same thing, but that is what we are going to do this weekend with our DISH, so that we can watch the shows that we DVR on our 2nd tv in the office, on our main HDTV in the living room.
We have a ton of shows DVRd but we never watch them because they are on the tv in the garage or the office and our main TV is HD and doesn't have the DVR. My husband bought 500 feet of coax yesterday so that we can circle the house 5 times and then jump rope... (actually it was cheaper in that quantity) but his plan is to hook up the regular dish to the HDTV as well so we can watch the DVRs and then also run some outside so that we can take the 9" tv from the garage out to the hot tub when we want. We are giong to have wire everywhere.
For $300 I'd pay the cable company rent. I think they charge us about $5/mo for a digital box.
Just a note of caution. A friend of mine was visited by the FBI shortly after purchasing a cheater box with a tv from a local shop. Seems the shop kept records of all of the cheaters they sold and were raided. My friend gladly gave up the tv and gave a statement in trade for time served and a fine.Bottom line - this is theft of service, if the cable companies want to prosecute, you will be SOL.