All three public radio stations in Baltimore showed substantial audience increases in the Arbitron figures for the winter of 1991.

Classical music WBJC-FM (91.5) had 8,200 listeners in an average quarter hour, up from 5,000 in the fall of 1990; National Public Radio affiliate WJHU-FM (88.1) had 5,600, up from 3,800; and jazz and public affairs WEAA-FM (88.9) had 4,600, compared to 3,200.

The three stations also showed increases in their weekly cumulative audiences -- the total number of area listeners who tuned into the stations at some point during the week. WBJC had 117,300 listeners, up from 98,700 in the fall; WEAA had 93,700, up from 57,100 in the fall; and WJHU had 89,500, up from 84,600.

Washington-area public radio stations WAMU-FM (88.5) and WETA-FM (90.5) had 2,400 and 1,900 Baltimore area listeners in an average quarter hour, respectively.