The Wally does not have coax connections. You will need to get a HDMI splitter and run HDMI cables to each TV or purchase a HDMI to COAX converter to connect to the existing coax cables. May need a coax signal booster also.
One thing to remember is that all the TV's will be watching the same channel as the Wally only allows on channel down, well one like cable channel and one local channel. I think they charge $60 one time hookup charge for you to purchase a 1Tb USB hard from somewhere and connect it to your Wally.
HDMI to COAX converter
HDMI splitter 1 HDMI in, 4 HDMI out