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this from the telstra site Leon
"External Antennas
A range of external antennas are available for maximising signal quality and range on vehicles. Antennas range in size and types and can improve coverage in the areas noted:
Low gain - city and major regional areas (0 - 3 dBi)
Medium gain - regional (3 - 5 dBi)
High gain - rural and major highways (6.5 - 7.5 dBi).
Antennas are most effective when directly connected to the phone via car kit or patch lead. Not all phone models will accept a car kit or patch lead.
It is recommended that your antenna is installed on a car roof as this provides sufficient height and stops the car from blocking the signal. By simply getting an antenna outside of a car you may gain an increase of around 10 times in signal strength. See your local Telstra Shop or Telstra Dealer for assistance with picking the best antenna option for you as well as help with installation.
Patch Leads
Patch leads are a cost effective alternative to a car kit and connect your mobile phone directly to an external antenna. This is a great option if you are changing vehicles because it means you don't have to purchase multiple car kits."
these might only be for phones though
but i assume if you have a small one for your dongle - a bigger size may be available
geoff
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