If you're a progressive researcher, red flashing lights will go on in your brain and a siren will go off as you read one key word in the following and not just for the usual reasons: It appears that Air America, the liberal talk-radio network, won't be on the air much longer in Dallas-Fort Worth. Guadalupe Radio Network, a Midland-based Catholic broadcasting company, has announced on its Web site that it will take over two Dallas-Fort Worth stations as of Oct. 1: KXEB/910 AM, which is Air America's Dallas-Fort Worth station, and KJON/850 AM. Guadalupe Radio will broadcast in English...