(1) While logged-in, Go to your Flightaware stats page by clicking following link
https://flightaware.com/adsb/stats/user/
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(2) Click the gear icon at top-right corner of stats (as pointed by arrow in screenshot below)
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(3) On dialouge box opened, click “Configure location” button
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(4-a) Option-1: You can set location by dragging the marker.
(4-b) Option-2: You can enter the Latitude and Longitude manually. Click radio button besides Option-2 to open manual entry dialouge box.
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OPTION-1
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OPTION-2
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(5) Set Antenna height