when Comcast decide to do they digital transition , one of the dta would not activate properly . the only advice Comcast offer be to `` remove any splitter . '' that be not really a option without lose cable service to most of the house . after replace the cable run to the problem dta with new cable , I be now able to activate the dta but the signal be still degrade to the point that several of the channel be unusable . internet search indicate that the problem I experience be not uncommon and suggest a amplifier . of course , Comcast will send a tech out to fix , but it be at homeowner 's expense . I be not willing to pay they to fix a problem they create . install amplifier -- quick and easy . there be a comprehensive installation sheet , but it be not really necessary since amp input and output be well mark . before installation , signal strength at the DTA input be about 15db with a s\/n ratio of about 25 . after install the amplifier , the signal level be 1.5 db and the S\/N ratio be 37 . Works great and I do not have to pay Comcast to fix the problem . my only complaint be that I have to do it in the first place . my cable service be not break before they implement they transition . after , I have lose service to two tv -lrb- unless I want to pay they extra for additional dta -rrb- , I have a rat 's nest of wire behind each of the tv where I install dta , and there be no particular improvement in service -lrb- unless you count several additional channel which be completely worthless . -rrb- but this be not about Comcast -- it be about the amplifier . five + star . solidly build , as you would expect from Motorola . if you be have problem after Comcast `` improve '' you service , I highly recommend you take a look at this solution .