What Is the Maximum cable length of the coax cable used to connect the Amplify preamp to its Power inserter. (CM7777HD)?

Connect the coax cable to the Amplify "Out To TV" port, and the other end of that cable to the power inserter "To Amp" port. We recommend that this cable be no longer than ~100ft. 

We know that some people have used longer cables, but it is not recommended. 

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