IF 1350 would get ESPN, they would simulcast it on 1600 which would keep 1490 from getting it. Likewise if 1490 would get it...that would keep 1350/1600 from getting ESPN.
Trust me folks....ESPN only looks at the 35 mile radius. They do not look at signal strength or anything else. I've been down this road twice with them.
Right 1350/1600 would keep it off of 1490. Still I think there's a good chance one or the other will end up as affiliates. Take 1440 out of the equation, along with 1400 in Harrisburg, then you have room for a new affiliate.