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Hello, I’m Nathan, and I’ll be assisting you today. My livelihood depends on your positive feedback, so your satisfaction is my highest priority.
Sorry to hear you’re having trouble.
This is highly dependent on your service provider and what equipment they use.
Some older boxes allow 2 tvs to share a signal, some even with separate tuners.As a general rule, for all new HD equipment you'll need a box for each tv.
Now if you are talking about an actual converter box for use with an antenna (and not a cable/satellite box), then that output could be split, but you can only tune in one channel at a time, so both tvs are stuck watching the same content. To watch 2 separate shows at the same time would require 2 boxes. This would generally be the case if splitting the output of a cable box between 2 tvs also.