BOOST WIRELESS ROUTER SIGNAL STRENGTH?

is there a way to boost the signal strength of my wireless router
(actiontek), i mean back in the day we used to boost our cb radios (anything
more than 4 watts was illegal) and i dont need that much more just enuff to
get to the whole house with out buying a repeater, i have tried diff mounting
points, my next guess is a larger antenna, but there has to be a hardware
tweak!!
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rf