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Sometimes the "booster" boosts the lines and waves as well.
Check the connections, are they old? Get the best quality conductors as well. I had my place re-solder all their video and s-video connections and lines went away. Got high quality 50 ft. cable too.
No more problems. However, when I got a booster, lines and waves are what got boosted(amplified). If you have other video equipment attached, projectors, etc. they kind of leak in interference as well.
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