RF modulator and standard coaxial cable works well.
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With an rf modulator how do you change the channel in the second room
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You don't. It's not a magic eye. It just outputs the same as what is on the main TV screen.
If you want to watch a 2nd channel in another room, buy another ZG or get an Android TV stick/box for about £40 and use Dream EPG (as long as you have a static IP on the ZG and a fast local network)