You would be using the HD-SDI terminals on the ex line.
Each line needs to feed into a switcher. That switcher then needs to feed out to the HD moniters.
With an HD-SDI you're limited to about 300ft, unless you boost the signal.
You need to tell us, what the moniter inputs are. That will then guide you to the board you need. Also the distance you plan on running bewteen you and the switcher. I used to do live events but we used triax.
A board like this with 4 HD-SDI inputs would do. It just depends on your budget. *i just quickly googled one, I dont endorse this product*
http://www.bhphotovideo.com/c/product/621082-REG/Datavideo_SE_2000_SE_2000_...
Barry
Associate Web Producer/ Video Editor
