Welcome to the forums! Can you please post your tvfool.com results for your actual location? The CM 7777 is an excellent pre-amp but is only recommended for fringe locations and to overcome high distribution losses. Tell us more about your tv-distribution. How many tvs? Number of splitters? Total length of cable run?
Also, I presume that you will replace the RS shack pre-amp with the new pre-amp, correct? Putting two pre-amps together is a no-no.
HTH
Rick
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