Just looking at a basic tvfool (center of town 20 feet up) both ABC & CBS from Beaumont, TX & Lafayette, LA say its possible with a attic mount antenna. the ABC from Beaumont and the CBS from Lafayette are on VHF so that hinders indoor antenna reception
As the case in smaller markets (short markets) they do want all 4 nets if possible in the market. And CBS & ABC would probably be the best to program when it comes to carrying it from the get-go as they have the most "national programming" of the 4 nets.
CBS has from (central time) 7-9, 10-noon, 12:30-3 along with 5:30 news, and primetime
ABC has 7-9, 10-11, noon-2 along with 5:30 news and primetime
The question would be would you get the eyeballs? There are people who probably have watched CBS & ABC from Lafayette for 40 years as they have been the defacto affiliates for that area and probably wouldnt change unless cable pulls them and puts in the "new" affiliates (which probably would piss off people).
You'd gain the folks who can't get ABC & CBS reliably right now.
Whats the worst case? Raycom buys the LP station, throws ABC & CBS on there and now you have a Lima, OH situation with one owner having all 4 nets?