Coaxial Feed Lines - DirecTV DVR

#1
For DirecTV TV services which include DVRs and receivers, Coaxial Feed Lines I have 3 coaxial lines coming into my attic; 2 from my satellite dish & 1 for cable/high speed internet. Can 2 or 3 coaxial cables be connected to a splitter, so satellite & cable TV can be utilized simultaneously or separately, instead of cutting & splicing when I want to switch from satellite to cable or vice versa?
 
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