500-1000ft. range wireless communication

[Jeckson]

When used wifi..the gain antenna is the problem.
used arduino with ethernet shield or wifi shield should OK.

J

[48X24X48X]

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Which kind of 900 MHz and 868 Mhz radio are you talking about?
I'm referring to the ones from Digi, the XBee-Pro for 868 MHz version and XBee-Pro XSC for 900 MHz. For LOS, the 868 can reach 40 km with adequate antenna gain. Sparkfun carries them.