I was about to buy an extender for my wifi as my laptop sometimes lost connection due to the hallway. The ISP installed a router on an ultra-short cable behind my couch. Instead of an amp, I chose to bring the source closer with an extension cord and this nifty converter. Download/upload speed tests show a 50% increase in my signal after putting the source by the side of the couch, and I didn't have to spend money on an amplifier or electricity to power it. Two thumbs up!
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