In west Houston, 690 is mostly splatter from local 700 KSEV, which has a noisy signal even at their 1kw night pattern. I have heard WQNO from New Orleans a couple of times, and talk, likely KTSM El Paso, near sunset. I've heard talk in SS but unable to ID.
When I lived right along the League City/Friendswood border (this is going on a decade ago now), KSEV was very noisy in my area at night to the point that it was a challenge to listen to. Of course, I was not in front of their night pattern by any means.
One turn of the radio usually would bring in a decently listenable WLW, although never at powerhouse status.
690 is one of those frequencies I never stopped by when I lived there, despite hearing San Antonio very well on 680 many nights and listening to WLW on occasion (I grew up and live again now about 90 miles from its tower).