Flashing LED for GSM car phone antenna - how to make one?

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**DONOTDELETE**

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Hello,

My first post this one
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I want to make a flashing LED to attach to the top of an antenna for a GSM device on my company vehicle, and need some advice.

I have seen them to buy for mobiles, but I want someting for a fixed antenna?

The GSM antenna on the car is for a GPS/GSM tracking system installed by my employer.

It has a GPS receiver and antenna to receive the vehicles location, then sends an SMS message using a GSM car phone, as far as I know.

I have no way of knowing when the tracking device transmits (when I am being watched) so that is why I want an LED on top of the aerial, that is just about visible from inside the car.

LED's I have seen for mobiles look like a coil and one component maybe?

Any ideas?

Thanks,

Mark.
 

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