I used to hear him late Sunday nights, I believe, on KGO, here in the Seattle area, also on a Superadio 3 much of the time (or my boombox). I remember him instructing listeners about gasoline's efficiency as an energy delivery service compared to other fuels. I think he also had a bit part in one of Clint Eastwood's movies in the late 80's. He seemed to have a scientific background, which gave him the aura of being that science teacher who can talk on the radio.
A lot of talk listeners around these parts tuned in to KGO. I even knew guys in the radio industry who were well aware of the station, i.e. -- they actually listened to it.
They knew about the late night guys, Wattenburg and Ray Taliaferro especially.