Actually, there was Primestar (pre-cursor to DirecTV???) as well that carried GSN from the beginning, or darn close to it.
Primestar was a competitor to DirecTV and Dish, which used a larger dish that was almost always ground-mounted. They went out of business in the late 1990s and sold their assets to DirecTV (and all their customers eventually got switched over to the DirecTV platform).
If I recall correctly, the first multisystem cable operator of any size that made a deal to carry GSN was Marcus Cable (now part of Charter/Spectrum), and then GSN made it to TCI's initial digital cable lineup when they rolled out that technology circa 1998.