Definitely NOT the broadcaster/station.
I work at a station and Comcast installed singlemode fiber to our facility. We didn't pay for anything, as it should be.
I also happened to be working in engineering one day and found a bunch of paperwork one of the engineers was working on from Dish and DirecTV concerning the 2009 digital changeover to ensure our feed wasn't interrupted at the changeover. I read it and it turns out the LRF for both Dish, Comcast, AND D* are all at the same place.
Based on this information, I would imagine that Dish and DirecTV share the cost of the facility and perhaps the uplink fees.