This will link you to a page that has different types of antennas just click on the model numbers and a PDF will pop up and you can read up on them. Mine worked pretty good untill i went to the car was and the Mother Fu**er was washing the top of my truck and broke it right off. Broke it so bad that the bracket that was holding it down under the roof riped out and put a hole in my roof. I had to fill in the hole myself and repaint the top of the roof. Pis*ed me off i talked to the manger and he said that there was no way they could have done it. Bull*hit i told him and left people are just stupied and dont respect anything. So i fixed the hole and just left the antenna inside the truck and it works great.