 Comerica Bank petitioned several times for FCC permission to operate the station non-directionally during all hours, with 50,000 watts days, and with 12,500 watts nights, subject to objections from co-channel stations.Under the terms of the special temporary authority or "STA", KTRB is required to reduce night power further, in order to mitigate interference.There are few stations in the San Francisco area whose existing towers have the requisite geometry for operation on 860 kHz at the licensed 50,000–watt level.