I was traveling along Interstate 5 today between LA and the Bay Area today and was using my new Cobra XRS 9970G. Throughout the trip, the radar detector kept going off with X, Ka, and K alarms. When they went off I couldn't help but wonder, "Where are these signals coming from?" I looked around and didn't see any sources for what my radar detector was picking up. (One possible thought I had was maybe they're coming from the really tall cell phone towers that have the half-ball shaped antennas?) Other than the occasional highway patrol officers and and their vehicles, where are these alarm signals coming from? Or are they mostly false alarms?