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Discussion Starter #1
The reception on my after market radio has went completely down the drain recently.

Does anyone know the part number of the antenna booster behind the drivers side quarter panel?
 

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I have and I've replaced the antenna and the antenna moint. The connection in the back of the radio is good and I have a direct ground I ran to the post near the battery.
 

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Smart antenna is special as many cars with fibreglass or plastic.

These cars do not offer a good "ground plane" to mount the antenna on body.

Instead, manufacturers install "ground free" type antenna or if you prefer, a real dipole antenna

If you look closer at Smart' antenna, you will see double wires threaded in helicoidal pattern. That is the both parts of dipole.

So, it is not a good idea to ground the OEM antenna, nor a standard "ground plane" antenna.

Hope this help you
 
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