the figure is actually -10. depends on several variables. gain of antenna, power of station, distance to towers, misc losses due to blockage/attenuation, losses associated with splitting and runs associated with that.
with stations 7 miles away the only amp that would work is the winegard hdp-269. 12 db gain, 3 db noise, with very high overload tolerance.
if the amp overloads at the antenna you can install it at the grounding block or use it as a distribution amp inside. the cm4228 you use also receives vhf so you may want to pass vhf and only amplify uhf which will take some of the edge off the overload potential.
you would accomplish that with the hdp 269 preamp and 2 cm 0549 vhf/uhf splitter combiners.
do this all the time and it performs miracles.
with stations 7 miles away the only amp that would work is the winegard hdp-269. 12 db gain, 3 db noise, with very high overload tolerance.
if the amp overloads at the antenna you can install it at the grounding block or use it as a distribution amp inside. the cm4228 you use also receives vhf so you may want to pass vhf and only amplify uhf which will take some of the edge off the overload potential.
you would accomplish that with the hdp 269 preamp and 2 cm 0549 vhf/uhf splitter combiners.
do this all the time and it performs miracles.