Hi, which dongle have you got & has it an antenna port ? 2km from the mast isn't far at all, you might just want to get the 3 Premium Dongle (£60 for existing customers). I started with a ZTE MF112 which worked but was very sensitive to the position and direction it was placed. The Premium Dongle is much easier to set up to get a strong signal because it has MiMo antennae built in. Also this will work with HSPA+ when the 3 network upgrade goes live so you could be looking at significantly higher speeds later this year.
You could consider an external 3g panel antenna like the ones on this list
and drop the 10m cable down from the roof or eaves to your 3g router into which the dongle is directly attached. You might not even need the external version if there is a window conveniently looking in the right direction & attach one of these to the wall under the pelmet.
The Premium Dongle Huawei E367 does have an external antenna port on the side, if you choose to do something like this you'd be best to check with the suppliers that the correct fittings for the port are supplied.
There is something called a modem mate which is a wrap around affair for dongles without external ports but I'd rather go with a proper plugin connection if possible.
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Edited by jsp21c (Sun 22-May-11 14:26:01)