I am a freelance utility and cameraman for ESPN and NBC in the NE area. Most of the stuff I do is just on NBCSN and the lower ESPN channels but I have worked on things like Monday Night Football before. Most of my job is running cables, we're there at least 6 hours before the show running thousands of feet of cable to cameras, monitors, mics, you name it. The fun part is that after the show, we have to coil it all back up and load it back in the truck!
During the show if I am a utility, I help a handheld cameraman manage the cable trailing behind him, it involves a lot of running in shows like football. If I am the cameraman, well I shoot video. I'll have my specific assignment, and anything else as dictated by the game. I basically just try as hard as I can to not be chewed out by the 2-3 people in the broadcast unit(s) that are trying to "tell the story".
I don't think people realize how many people(and how much money) it takes to put on shows like that. Regular old college football is going to have at least 5 cameramen, 2 utilities, 1 audio mixes and at least 2 assists, 2 replay operators, a graphics operator, director, technical director, AT LEAST one producer, 3 Broadcast Engineers(what I hope to be one day), a red hat(not sure what theyre real title is, they stop the game for TV time outs), a "Video" person(they make sure all the pictures look good and manage the iris levels of the cameras remotely from the truck), and of course all the talent, play/play color and probably a sideline reporter.
That isn't even including the people back at base, but that's probably only one or two people.