We have just upgraded from the standard fetch box to the new mighty box. When we connect the antenna we are not receiving all Free to air channels and the ones we do have are all pixelated. We have disconnected the fetch box and used the TV to test the antenna , there was no screen problems then.
Sorry to hear you're having some troubles with the Free to Air on your new Fetch.
Have you been able to perform a Soft Reset?
You can also check out the FetchTV troubleshooting guides
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