Yup I remember clearly.
Yes we have tested "real world" and done some extensive soak tests, but not at those sorts of distances.
We're scheduled to do some range-bandwidth tests soon, but believe it or not, for a wireless vendor, we've a lack of good sites (we're based in surburban south west London - doh!), and time on other big customer projects (laser) has delayed our radio range testing.
If you have a couple of towers/sites handy, and some big antennas for the long hop, we'll gladly loan you some equipment to test, including back-to-back as well as single link throughput.
That'll get things done super-quick, and tell you if this is going to be a winner or not ...
How does that sound?
CableFree - Wireless Excellence - Microwave, E-band Radios, Free Space Optics, High performance Radios & Routers