Historical clue formulations

• Big source of political talk — 2020-02-21
• Talk show medium — 2019-12-26
• Band not known for music? — 2018-02-08
• Traffic report source, often — 2016-07-30
• Big news medium — 2015-06-19
• Medium for much political talk — 2014-11-05
• Rush home? — 2014-08-01
• Common source of talk — 2012-07-06
• Source of much talk — 2008-10-11
• Medium for mostly news and talk these days — 2007-04-30
• Common news source — 2003-01-31
• Source of a lot of talk — 2003-01-24
• It's about 55 and up — 2001-01-27
• It's mostly talk nowadays — 2000-11-26
• Its range is about 500-1700 kHz — 1999-04-17