3 km wi-fi link, how?

Hello,

I'm wondering if it's possible to set up a decent wi-fi link between
two points ca. 3 km (2 miles) distant from each other (I have line of
sight). Most important, I'd like to know what gear I'd need for a
project like this one. Which kind of (directional) antennae should I
choose? how much should their gain be? do I need special APs to drive
them, or external amplifiers, if anything like this is needed at all? I
hope that you can give me some suggestions, because I have no clue. I
tried to search the net, but these questions must be either too stupid
or too difficult to answer, as I found nothing (that is, nothing that
I'd be able to understand anyway).

Thanks in advance.

.

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