Quadrupole Collinear Phased-Array Wifi USB End-Fire Antenna full CNC production version with an estimated gain of +20 dBi (project collinear multi-layer PCB's to replace single-layer PCB's of prototype).  Includes extended-range USB Wifi electronic unit, either: BearExtender for Mac or TP-Link for PC (Project Quadrupole antenna replaces BearExtender and TP-Link rubber-ducky antennas).  Backers will be asked for preference.  GUARANTEE: Antenna will test with highest front-to-side gain on record - at its center frequency of operation - or backers can get their money back.  Shipments expected to start in June. 

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