The station's signal travels in about a 45-mile (75 km) radius from the transmitter site, though this is variable since it uses a directional antenna. The signal also reaches far south-southwest metro Atlanta, and is a better source for GPB in that area than its main station, WGTV.
WJSP primarily serves the northern and central part of the Columbus TV market. The southern part of the Columbus market, as well as much of Columbus itself, is served by Dawson's WACS-TV. While WJSP is the official GPB station for Columbus, its signal is marginal at best in much of the city.
The station had originally chosen to return to channel 28 for digital TV during the first-round digital channel election, but due to an interference conflict it was forced to remain permanently on channel 23.
There was also one broadcast translator, W49AD, channel 49 in downtown Carrollton, in the southwest corner of the Atlanta market. That translator's digital companion channel is W13DJ-D on channel 13, on-air since July/August 2009, but officially relaying WGTV. It is east-southeast of town, immediately southeast of the Oak Mountain Championship Golf Course.
WJSP-TV signed on August 10, 1964 as the fifth public television station in Georgia. Its somewhat reduced-power digital signal, on channel 23, began in 2003. In 2009, analog transmissions permanently ceased at midnight on the night of February 17.
The channel 28 frequency was originally home to WTVM from 1953 to 1960, when it moved to channel 9.