Originally Posted by mrblister
Are you talking about FM reception. If so FM channels work best at different heights of the antenna. The OEM antenna goes up and down depending on what channel you are tuning to. It does this automatically to get the best reception.
AM channels in my sc430 do not work well at all. In fact I find this to be so in all of my other cars. Years ago AM stations had more power that could explain why the dont perform well now
AM is amplitude modulation and FM is frequency modulation. Thats why the antenna works at different heights for FM
I under stand FM signal works better in heights. But why do I get great reception outside of the car perpendicular to the rear deck or better yet out 2 feet away same height as the door. BTW AM or FM