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You have two problems. The amp. and the amp.
When the amplifier is on, it may be overloading due to the strong signals from nearby stations. When it's off (powered down) it blocks the signal because of the active electronics. The antenna you are using will work better that the 4228HD because the beamwidth of the 4228 is narrow and will make aiming more difficult. Just eliminate the amp, and install a two set splitter. All will be well!
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