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Re:I amplified my home's Wi-Fi with aluminum foil by jacquesm on Tuesday December 26, 2017 @07:53PM (#16012059)
Quarter wavelength. Waves will flow around something smaller than 1/4 of their wavelength almost without interruption.
Re:I amplified my home's Wi-Fi with aluminum foil by gerdesj on Tuesday December 26, 2017 @08:35PM (#16012204)
Thanks. Could you point me in the direction of some reading material?

That has the look of a rule of thumb, which as a civil engineer that ended up in IT, sounds a bit familiar.

Re:I amplified my home's Wi-Fi with aluminum foil by vvanders on Tuesday December 26, 2017 @08:46PM (#16012251)
I've heard good stuff about the ARRL antenna book, although it's pretty large and spendy.