WAOB-AM/FM (860 Millvale/106.7 Beaver Falls) and WPGR-AM (1510 Monroeville) are all expected to return to the airwaves on Sunday with what Scott Fybush calls a “Catholic Radio trimulcast”. The stations will air a live broadcast of the Mass from the Blessed Sacrament Cathedral in Greensburg. All three stations have been off the air since September 8 when they were formally taken over by St. Joseph’s Missions. Sheridan Broadcasting sold the old WAMO-AM/FM and WPGR-AM to S.J.M. for $8.9 Million last summer.