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How can I boost my 3G modem's signal strength?

Modem: e220.

Are there any solutions? Can I attach a "bigger antenna" to it? How? What?

Thank you!

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closed as off topic by Sathya♦ Jun 17 '11 at 6:50

Questions on Super User are expected to generally relate to computer software or computer hardware, within the scope defined in the faq.

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