And that COAX is connected to what antenna?
OTA or Over The Air is not a sure thing.
Cable TV companies are dropping clear channels in favor of their digital box for the very reason you are complaining. And that other reason. Since tuners are all over the map on performance if you are a cable company you want to drop all channels that don't require the set top box to free up bandwidth and cut out the calls from folk that can't get a channel on cable.