I use an ATT Wireless Broadplan using their "Unite" modem for backup. It's $50/month for 5gb of data. It's pretty reliable on Big Barn Door. The modem has antenna inputs if you need a little help with signal strength.
I don't know what the chances are that it would make the whole winter without getting hungup at some point. Based on many unhappy years of satellite broadband, I'm amazed that it will run through the winter for you without a little manual help.
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