Is there anyway to aggregate multiple devices, radios, and antennas in a point to point bridge application beyond 20+ Mbps full-duplex to the 300 Mbps full-duplex range? Perhaps ppp or some proprietary protocol could be used. Are the radio designs restricted to the 802.11a, b, g, and n protocols? Are there any custom radio protocols?
I believe if you search the wireless forums you should find a thread about someone using Cisco 1252's on both ends of a bridge, with multiple antennas and 802.11n. Cisco doesn't support that config, but someone in the thread got it working.