2003 Buick Lesabre, Custom.

What is the little antenna used for that is located on the outside rear window, passenger side? It is related to the small black plastic container (size of pack of chewing gum) that is glued to the inside front windshield, above the driver.

Mike from Cleveland

Can you take a picture of it?

On my Bonneville that was the antenna for OnStar. Does your car have OnStar?

Onstar antenna'* are shark fin shaped and are usually mounted on top of the roof

I'm wondering if maybe someone installed a remote start system.

Nay nay my young friend. The onstar antenna on my 2001 Bonneville was mounted to the rear glass on the passenger side. It had a short metal antenna, about the diameter of a coat hanger, formed into a spring shape at the bottom and straight from there up.

Actually Roy, I am correct. If you had READ what I said in reference to the shape of the antenna, I am correct. But not in the case of his antenna. His is missing the antenna itself, but still has the mounting plate still attached to the glass. The newer style/shark fin antenna is a dual antenna. One is for cellular and the other is for GPS.

Here is a picture off the internet of a 2003 Buick Lesabre. The antenna on the rear glass shown in picture is the OnStar antenna.

Read up slick.

guys, now this is tongue in cheek, only Edward Snowden knows for sure, including what'* under your back seat.

2004 Bonne SLE
1971 Chevelle SS

So you were correct, but in his case you were wrong? Doesn't that make you wrong?

The 2003 LeSabre only had the analog antenna, which is mounted to the rear glass as show in the picture.