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Active vs Passive GPS Antenna
Amazon.com: Adafruit Passive GPS Antenna uFL - 15mm x 15mm 1 dBi gain [ADA2461] : Electronics
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Amazon.com: Proxicast Active/Passive GPS Antenna - Through Hole Screw Mount Puck Style with Right Angle SMA Connector on 20 inch Coax Lead - 28 dB LNA (ANT-190-003) : Electronics