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i am a direct tv tech. your cable should not exceed 150ft.direct tv uses low line voltage(13v and 18v) so no signal booster or signal amp can be used. use of any kind of booster or amp will ensure your dtv system will not work and may even be a fire issue. a 4 x 8 powered multiswitch from direct tv will keep strong signals with cable upto 150ft. J.Davis,North East,MD

I've gone 20ft and no problem. If you have a good cable it will go longer.

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Q: My Direct T.V. dish is roof mounted . Over the years trees block signal . How far in length can the cable be w/o degrading the signal when having to use a ground mount . Is a cable amp needed over a certain distance Thanks f. Marshall Dublin Ga?
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