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possibly external, according to your post the box isn't receiving a signal at all which would indicate either a break in the cable between the street cab and your house or between the point on the wall and the box. It COULD be the receive module in the box, but I would be more tempted to assume the cable.
Could be worth checking if the cables are ok (if you have disturbed any of them) there should be a thin copper wire sticking out from the center of the plug.
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