Hi. I'm relatively new to scanning. I listen in the Los Angeles area. I have a Uniden BCT15X scanner and love it. I have a number of conventional systems programmed and humming along including LASD, CHP, and LAFD. However, I'm having less success finding analog trunked systems with lots of activity to listen to. Can anyone name a few and the best times to listen? I have a standard back-of-the-unit antenna but plan on upgrading to something on the roof or in the attic. Thanks!