Lines across my tv on low channels when my cable modem is on?

I get these annoying lines across my TV on low channels 2-6. I don't have a cable box. I just get channels 1-20. The cable goes to a splitter, which then splits to my cable modem, and the TV. When I unplug my modem, the lines go away. Any ideas why this is happening? This is nothing new, it's always... show more I get these annoying lines across my TV on low channels 2-6. I don't have a cable box. I just get channels 1-20. The cable goes to a splitter, which then splits to my cable modem, and the TV. When I unplug my modem, the lines go away. Any ideas why this is happening? This is nothing new, it's always been like this.
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