The Fox O&O's might be ready to walk away from the Nielsen monopoly.

The Fox Television Stations contract with Nielsen expires Today and sources say that while the two sides are talking about a new deal, they are far apart in negotiations. 

Fox is looking at using rival TV ratings service Rentrak.

Update: Sources tell FTVLive that Nielsen folded like a lawn chair and gave into Fox's demands. This should be a lesson to all other stations and groups that use Nielsen, threaten to go and you will get the service at a huge discount.