You don't want to do that. The amps that you can get that'll boost it that much will introduce an insane amount of noise to the line rendering most the signals unusable. Also if the cable is being used for something like a DOCSIS modem i.e. internet, the signal will be useless anyways if you do not buy an amp to boost the signal both ways. I'd recommend you get a proper install with a technician out there who'll do the proper line amp boosts or just give you a new cable drop at whereever you need.
Another thing is always boost pre split if possible.
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