There is a list of radio network affiliates at SportsByline.com.
You can listen to the program online at the SportsByline.com Web site. My personal preference is the DragonKingPress.com Web site, online home of one of the finest wrestling history publications around. Go to www.DragonKingPress.com and click the Community Link on the left side menu bar. The top link on the page is the live stream to Sports Byline and the Wrestling Observer Live show.
You can participate live by calling 1-888-878-PLAY. For the alphanumeric challenged, that's 1-888-878-7529.