It's site 9 of the Palmetto 800 system that covers the central portion of Charleston Co., including the city of Charleston and immediate vicinity. It's apparently in an area known as Hagood. Think the old Johnson Hagood stadium, perhaps?
To the north is Cell 26 Awendaw covering northern Charleston Co. into Georgetown Co.
To the south is Cell 27 Ravenel covering southern Charleston Co. into Colleton Co.
To the northwest is Cell 52 Moncks Corner covering most of Berkeley Co. into northern Charleston Co.
To the west is Cell 12 Summerville covering most of Dorchester Co. and what you'd listen to along I-26 into Charleston Co.
See the map for a better idea.
Brian