San Francisco: KNEW
IIRC, he had been on 560 previously. Major downgrade in signal, much more than the 640 to 1150 LA downgrade.
There was a huge article in the LA Times about Rush's move, and it was covered in heavy detail through conservative media.
That brings up an interesting question of how many conservatives read the LA Times.
I only knew of the change from sources like Inside Radio and Tom Taylor's report; while I would occasionally sample Handel on KFI, I did not hear of the change there except by deduction from hearing the promos for the replacement show. Then again, I am not a Dittohead and was probably not paying attention.