Most people, of course are non "technical" and if you tried to "explain" the interference problem they either have no idea what your talking about, or think you're B S-ing them or both !KCBS signed off for maintenance Saturday night/Sunday mornings from 2 AM - 5 AM instead of the more traditional Sunday night downtime. It was done that way so if we ran into an unexpected problem we'd trash some of the less critical Sunday schedule instead of intruding into Monday morning drive time. After we returned to the air I'd have a leisurely breakfast at a local restaurant and then spend the rest of Sunday morning driving through the Sonoma County countryside taking the day and night pattern monitor point measurements. We'd stay on night pattern until I completed those monitor points, then I'd call the studio and have them switch to day pattern.
I was the transmitter tech for KCBS and my work schedule was Sunday-Thursday with Friday and Saturday off. I liked it because it meant I could visit the more popular Bay Area destinations on Friday and miss the weekend crowds.
During the winter months we'd wipe out KBRT at their Costa Mesa studios during the last hour or so of their broadcast day. At one point the person who bought that time on KBRT couldn't hear his program on the mainland and called our newsroom line claiming we were operating illegally, which got our news crew all upset. I had to contact KBRT's engineer and he told them to knock it off.
BTW you might find interesting that way back when, probably in the 80s, KBRT was exploring the possibility of operating at night with greatly reduced power, they were experimenting at sunset time with the on-air personality telling the listeners what they were doing. The engineer at the transmitter on Catalina Island was also briefly on air. They were alternating between 500 and 250 watts. They asked listeners to call in to tell them about their reception. Needless to say it didn't work, too much interference. The engineer commented on air that when they ran 500 watts instead of 250, even in Avalon you could still hear KCBS !