[nznog] Suggestions for router with 3G external antenna for remote site comms

Hi All, We have a bunch of regional sites (weather probes) that run some equipment, 2 PCs and are connected to the internet. At the moment it's dongle city which I would like to change over to something a little better :) I am looking for suggestions on a decent (business grade) router with 3G capability an external antenna connection. At each site, the equipment sits in a rack, inside a hut and signal strength is reasonable (3/5). My thinking is to deploy a basic Cisco router with a 3G WIC then an external antenna on the same mast where we collect weather data. Happy to hear suggestions and input. Many thanks Darren.