Stewweeks, yes you must have both an input from the sat dish plugged into the sat box and an output which in your case could be to the front TV. If you plug to front TV only then you can use a short HDMI cable. If you want to get sat reception on the other TVs you need to do something like I described in my prior post.
2015 Jayco Seneca 36 FK
2016 Jeep Wrangler Unlimited tow
2010 Tiffin RED 36 QSA - gone
2011 Monaco Monarch class A - gone