Regarding the WBT signal on 11.10AM. It is indeed a strong AM signal in the core Charlotte area counties, and can be heard up and down the East coast at night, from Canada to the Caribbean, as they used to say. However it is at night where the signal weakens to the west, and that is why 99.3 was added to fill the null from Gastonia to Shelby.
99.3 can be heard here in Spartanburg before interference from a Georgia signal WCON begins to kick in as you travel southwest into Greenville County. And 99.3 does not reach all of Mecklenburg County. Which is why there is speculation regarding a stronger FM signal for WBT, perhaps eventually on 107.9, if they ever abandon the Mix format. Ironically, 107.9 was the original WBT-FM, although not a simulcast of the AM signal. I believe it was an easy listening format originally.
And a stronger FM signal for WBT would be less subject to static, noise, and interference which can hider the AM signal. Here in Spartanburg, in the car, I listen to WBT on 107.9-HD2 or 99.3, depending upon location. If dropouts emerge into Greenville County, I switch to 11.10 on the AM signal during the day. For news and talk, I prefer WBT rather than WORD, although they have a superb signal on 98.9.