Amplifying HDTV signal, advise needed.

hello,

have 5 tvs outfitted comcast digital boxes , 1 of them not receiving channels. fifth tv furthest away source (12-15 meters) cable length possibly on 50 ft. highly suspect missing channels due weak signal. have hdtv amp, appears not provide enough juice.

question this, can add amp raise db fix problem?

 

adding amp on power system causing other issues. call comcast, hd takes lot of bandwidth, problem might many tv's.

 

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