44th and Sooner.
It also looks like a bunch of permits were issued last fall
10/9/2012 - SW 119th & Western - Replace existing antennae on existing tower
10/22/2012 - SW 20th & Meridian - Spring Antenna Modiciation - Drive Train: Remove & replace 6 antennas, relocate 3 & add 3 cell cabinets
11/5/2012 - Rockwell & NW Expressway - Remove and replace one antenna, also to put new cabinets on the existing slab
12/5/2012 - SW 54th & Meridian (OKC Airport) - Add cabinets on existing footprint, replace 6 antennas
3/4/2013 - SE 44th & Sooner - Atenna and equipment installation only
Go to http://www.okc.gov/access/, then click the "Permits" tab and type"Sprint" in the "Application Name" box. That'll pull up everything for OKC.