TV Aerial - 90V to Ground?

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I got a little shock when I touched one of the component connectors on my TV. I got my multimeter and then I found that between either contact on the TV Aerial Connector and the Ground, there is 90V AC. Is this normal? Is this just the TV signal?

The TV Aerial Connector is plugged into the wall outlet, which goes to the Antenna on the roof. There is also an Amplifier being used but I'm unsure how that works.

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