cyberdad said:1030 was stronger than KTNQ...which I forgot to mention earlier.
KTNQ, even daytime, is pretty much a flashlight beam from the eastern side of the market (City of Industry) over the LA basin and out to sea. The Orange County signal bites daytime, and is pretty useless at night.
The biggest surprises were 790/930/980 as well as 740. 710 was a mild surprise, but I already knew their coverage could be "eccentric".
710 is reasonable... it is 50 kw pushed South by Southwest in the daytime, so the OC signal is pretty good.
As Scott says, 930 moved from a good, high conductivity site to one that sucks big time and is quite a ways to the Northeast. The signal to the south, particularly on the non-DA day pattern, is much less.
The 830/870 situation is also a little puzzling. I was in Woodland Hills (Warner Center Marriott) the night before I came down here. Even though I was on an upper floor and the internally generated noise wasn't all that bad, only the stronger signals were getting in. 870 was OK, while 830 was struggling.
830 has a usable signal daytime about to downtown; anything to the north of that is noisy to unusable. At night, the pattern is much tighter and it is pretty much unlistenable in the northern half of the market. It's basically a glorified Anaheim/Santa Ana/Garden Grove station.