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What type of Antennas to use for XBeePRo 2.4Ghz

I am planning to use 2.4Ghz XBeePro 63mW Devices for a project that requires a coverage area of around 1.5-2km. When i go to select an antenna there are various options like Circular,Virtical, ...
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Robot docking for self-recharging

I want to build a simple obstacle avoider robot, but this time I want it to be self-recharging so I am building a dock for this purpose, so I want it to be able to locate the dock and go for it when ...