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The amplifier looks like the size and shape of a balun - maybe it's just the power injector, and the amplifier is actually in the antenna body.
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Nope, that's the amp itself, it doesn't use a power injector in the coax line. It's powered from either a USB port or from a wall-wart that the USB-ended cable plugs into. You can always use the wall-wart to charge your cell phone if you supply your own cable, it's just a common 5V USB supply.