Blast Limbaugh Out of San Francisco Radio: a Guide from Daily Kos

That's where we can come in as activists: we can make it an even harder sell. Yes, this means listening to Rush, at least for a day or two, but I'll make it easier for you. Here is a link to the program clock for Rush's show. You only need to listen during the minutes when local stations can sell ads. They're marked in green - from 18 to 20 minutes past the hour, from 30 to 34 minutes past the hour, from 45 to 46 minutes past the hour, from 54 to 56 minutes past the hour and from 58 minutes before the hour to 6 minutes past the hour (most of that one will be network or local news.)

Listen for a day or two during those times. Make a list of the local advertisers you hear there. Look up their contact information and go have a chat with them about what they're supporting. They may tell you "we're not specifically buying Rush," and they probably believe that. Most Limbaugh affiliates are part of larger station clusters that also include several FM music stations, and it's not uncommon for "the AM station" to be sold to advertisers as part of a bigger package. This is OK. You can still ask them to ask the station to remove their ads from the Rush show, or even entirely from the talk station that's carrying Rush...and you can make noise locally if they don't. No business wants people demonstrating outside their store because of where they choose to spend their advertising dollars...

Link to Program clock http://engineering.premiereradio.com/xds%20jpg%20clocks/XDS%20Aff%20Rush%20Limbaugh%20Hour%201-2.jpg