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The only way to use your Roku for two tvs would be to connect it to an HDMI splitter with two outputs and run HDMI cables to both sets. The Roku can only output a single channel, so both sets would receive the same signal. You should use a splitter with its own power supply that does the HDCP (High Definition Copy Protection) negotiation with the Roku. But even so, such splitters are often troublesome, especially if your tvs have different resolutions.
It is probably easier (and maybe cheaper) just to purchase another Roku for the second set.
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