You can get a docking station, either for a car or desk, then you can add an external antenna. That's if your laptop has an RF output. On my Toughbook I have a Dual RF outputs, one for my Verizon, and one for WWAN.
I need to amplify a wireless signal so that my dell laptops that have broadband cards embedded in them can have better connectivity. The locations of the laptops change and there can be sometimes as many as 15 laptops with boradband needing a strong connections. Any one have any solutions for this large amount of laptops?

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