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There is no possibility of adding a module because mimo standard is at least using 2 radio in one mac. The new linksys ap and others are not MIMO technology. Atheros AR5xx5 chipset would have 2 radios in one card and 4 antennas. It does smart antenna...
You might want to use 5.8ghz frequency range between 2 nodes enable to achieve line of sight. With 2.5k budget, it is really hard to deploy 10miles wireless link. There are some wireless vendor that offer product more than 20miles range, but the pric...