"Still not an insurmountable obstacle - if WBTA can coexist with the current KB, it can certainly coexist with a relocated KB at a similar distance, especially if the "new" KB is a DA-1 like the existing KB with a null toward KOMA, since Batavia would fall in that null too."
Might not even need that. Remember, when we talk about WBTA we're talking about a station that's in the main power lobe of KB now. Move the 1520 transmitter to, say, Hilton (if you're changing location and COL to Rochester and using it to go head to head with WHAM), operate omni by day, send the night null in the requisite west-southwest direction, and you still don't send a 25 mv/m city grade signal toward any third adjacent channel station even if you're on a single stick between sunrise and sunset. You may be able to operate your 1520 station as a 50 kW-U, DA-N with pattern change an hour past local sunset, coinciding with Oklahoma City sunset, when KOKC flips from non-D daytime to night pattern.
The night pattern would probably look like KB's current pattern. Maybe just a smidge looser because you're further east from anyone you have to protect.
Of course this only makes sense as a strategy for Entercom to use if it keeps KB and uses it to strengthen its cluster position in Rochester by knocking WHAM out of the box (easier to do than you might think these days since they're really living on their morning show and 5 PM news), picking up a few 35-64 share points, and leaving FM sister WBEE in the top spot 12+ to pick up more of the national agency business that a market leader always gets in any sizable town.
I hope they never do this, because I like working for the #2 news-talker and #2 AM in the market 12+ and hope it stays that way with no one to threaten that...
And I doubt they ever will. When you talk about setting up three 400 foot towers, a pair of 50 kW transmitters with phasor, transmitter building, all the land acquisition cost and all the cost of setting up studios (even if you're just putting new equipment in a few rooms in another corner of the Mill Street building) you're talking serious seven figure money and looking at years (if ever) before you amortize that investment.
Never happen...they'd be better off selling the damn thing to someone who wants to try to make a go of it in Buffalo, knowing the probability that they won't be able to make a serious dent in WBEN unless they spend an insane amount of money to do it.