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You can buy directional ( Yagi ) gain antennas to use with Next G etc. They are fishbones shaped and and look like the UHF TV antennas only smaller elements. You need to point it in the direction of the tower. That should get you a solid connection.
Next G's gonna cost if you start using it for online gaming etc however.
the one on the car , tesltra have a home one that dont have the spring base $105 not sure if it includes the adaptor ( the one to connect from the aerial to your modem) they are about $5 depends which modem you have
been thinking , do you have an usb extension cable, you could plug your modem into that and would that give you the possibility of placeing your modem next to a window