Electronics Repair Questions? Ask an Electronics Technician
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Sorry to hear you’re having trouble.
You can't do anything to boost the output of the modem itself, that is a limitation of its internal antenna and power supply.What you can do however is to use a wifi extender/booster as separate equipment. Or, preferably (if your roku model has an ethernet port on it) use a powerline extender.
Here are 2 recommended options for this -
Booster/extender: http://amzn.to/1GJpKckPowerline extender: http://amzn.to/1RBB5vC