Give them full coverage on the DFW market they'll do well. I'm not talking top 20, but they'll pull in enough numbers to justify their existence, and more importantly they'll bill enough to justify their existence.
I suppose you're making a hypothetical statement, since the Ranch will never have a full market signal or anything close to it. Right now, like you said, Arlington is about the eastern limit of their coverage. Even after their upgrade, with an increase from 80 to 100kW and antenna height a little over 300 foot more than they have now, it won't change much. They may
gain some rather sketchy coverage into northwest Dallas County, but even that's debatable because of that pesky co-channel translator in Garland.