Haven't been there to check, but I suspect that the solid coverage for K217GB is limited to the high-dollar areas bounded by 288 on the east, 59 on the north, and the South and West Loops, extending into the outside-the-loop areas of Bellaire and Meyerland, which was probably the intention, anyway.
In Bellaire and Meyerland it's getting clobbered by KVLU out of Beaumont. You'll know you're hearing KVLU and not K217GB in the morning when KUHA is playing music and KVLU is carrying Morning Edition.
Other times of day both are playing classical music, so there may be times where you think you're getting the translator and you're really getting Beaumont unless you check to see if the pieces match or you hear an ID.