Wireless Pt-Pt in Washington DC ?

Thanks to all who replied to my original request for Orlando. I'm looking for the same info now for Washington DC. I need to organise temporary Internet connectivity via fixed wireless at DS3 or higher rates. Preferably microwave link, and I can provide necessary equipment for the duration of the link (about one month) if need be. For those who made LOS queries, my end of the link would be Connecticut Avenue NW, 20009, about 11 stories up. It would be extremely advantageous if the far end can give me native IPv6 connectivity also. As last time I welcome both positive and negative experience with these kind of ventures and local companies. Many thanks ! Ben.