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No amp needed. Worst case insertion loss for coax with RG6 is about 6 dB/100' at channel 51. Your LOWEST calculated NM for the weakest Portland low power station is 46 dB. Allow 8 dB IL for the coax, you still have 38 dB of margin for splitters and fading (which should be negligible with LOS signals) before clutter loss and antenna gain.
You don't need to "overcome" cable loss when your available signal budget is more than adequate to cover those losses.
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