A big chance for Gospel on AM was missed 20 years ago with the never-launched "Joy 1190" KJOI which was owned briefly by Radio One. I don't recall the specific reasons for the format never getting on the air, but I think it had to do with all the consolidation and station sales that were going on at the time.
1190 would have been a good place for the format...solid market coverage during the day. Decent night signal confined to Dallas County, but still would have hit a large part of the target demo.
Radio One tried Urban Gospel on FM with KROI in Houston from 2006 to 2011. While the presentation was good and the 6+ numbers respectable, the audience was way too old, and hard to sell to advertisers.