From digest.v7.n371 Fri Oct 3 09:24:15 1997
From: "Ganess, Sean" <sg04537_at_imcnam.sbi.com>
Date: Fri, 3 Oct 1997 09:56:31 -0400
>From what I understand, there is suppose to be a cell phone antenna
built into the car for the factory phones. When I installed my Nokia
car kit, I was planning on tapping into this antenna for the phone but
never quite figured out how. I figured I'll do some research on it but
in the meantime, I picked up a Leapfrog(? I think that was the brand)
concealed cell phone antenna that I planned to install in my Nissan
Sentra when I installed a cell phone kit in that car. To make a long
story short, I never got around to figuring out the BMW cell phone
antenna (nor have I spent much time on it) and the Leapfrog antenna is
still temporarily installed in my car (located on the top of the
passenger footwell area, just hanging around but out of site). A
conventional external antenna is out of the question for me. I don't
want to ruin the beautiful lines on my car.
Anyway, the Leapfrog doodad is a piece of coaxial cable that goes into a
black rectangle, smaller than a paperback book and about 1/4 inch thick
at most. One side is covered with adhesive so you can secure it to any
non-metallic surface like a window. How does it perform? Well enough.
Granted, it seems more sensitive to signal loss when I go under an
overpass or out in a rural area where cells are far apart but I don't
have it mounted in the best location either. The Hirshmann antenna
seems to be a MUCH better design. It's two pieces that mount on both
the left and right sides of the car within the bumper. It's also
located in a better position outside the car unlike my temporary
location within the passenger compartment. Since it is designed for
various model BMWs, you won't have to worry about cable length and I bet
they include instructions for mounting and running the cable for your
specific car. The length of cable on the Leapfrog antenna will never
make it to the front bumper.
If anyone has info on how to tap into the cell phone antenna built into
late model BMWs (in my case a 1997 ///M3 sedan), I and I'm sure many
others would appreciate some info. Otherwise, I may consider the
Hirshmann antenna as a permanent solution.
>Am planning to add an integrated BMW phone and wonder if anyone has
>the Hirschmann Cellular concealed bumper antenna. This removes the
>window location problem for 3's, 5's and 7's -- but do they work as
> See page 27 of the October Roundel.
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