I'm guessing you can have unlimited data via tethering.
However I'd have thought that would lead to a weird internet experience where you end up seeing mobile versions of sites on your desktop machine because of the IP address and headers presented to the web server at the other end, and/or that video sites will select low res videos because of the connection type.
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I'm not completely happy with the antenna. I seem to get much better performance by tethering my phone.
The best I can get through the antenna is around 12Mbps...