Direct TV installation, plus a whole lot of other stuff

Go out and grab an RF Modulator. This will allow you to use the receivers red/white/yellow output (Composite) and convert it to coax output. They cost less than $40 and you will be able to feed this to your selector box. This output will be in SD and not HD but that's your only option unless you want to add HD wiring (new HDMI cabling) or a wireless HDMI transmitter.