Well I have had the same question as it really never seemed to work. So currently I'm in the process of installing a Pepwave system from Mobile Must Have. What I finally think I have figured out is that the WiFi Ranger antenna on the roof is also the router. I have started pulling it off the roof and there are only two wires attached and I believe they come straight from the wall switch. I plan on checking it with a voltmeter this weekend.
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