How to split a signal from a coaxial wall outlet to 2 separate cable boxes - DirecTV

Currently in my den I have a DTV receiver connected to the tv in the den. I am going to add a tv to my patio. I want to place a 2nd DTV receiver in the same cabinet as the main DTV receiver in the den and connect it to the tv on the patio.

My question is how do I split the cable signal in order to connect both DTV receivers since I only have one coaxial outlet in the room.

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