Best Antenna for Fortuna Clip-on?

[LeeInDocklands]

I'd like to leave my Clip-on in my Saab's glove box, but the signal isn't quite strong enough in there when the weathers bad, in urban canyons, or under heavy tree coverage.

So I was wondering if anyone could recommend an antenna? This will probably end up mounted inside the car.

I bought the Clip-on fromt http://www.globalpositioningsystems.co.uk/ and they list the Emtac and Haicom antennas as accessories but without much information on either.

Any help greatfully received.

Lee

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