You will need 2 short coax cables to go between the dome and the SWM8 switch. You connect these short coax cables to the SWM8 switch. There are 4 inputs but you only use the 2 indicated (google the Wineward SWM8 setup if you haven't). There are 2 outputs SWM1 and SWM2. Connect the existing coax to the outputs and those will go to the 2 receivers inside. Inside you connect the 1 coax that runs from the SWM1 connect to the PI29 (not home PI) and then from the PI to the receiver. The other coax connects directly to the 2nd receiver.